Finally a solution for S2's horrible battery life that I can live with... - Galaxy S II General

The Samsung Galaxy S2 has horrible battery life. The 1650mah battery will not suffice to anyone but light users.
In my eyes, there are many unacceptable solutions:
- Disabling battery hungry features (lowering screen brightness, undervolting CPU, uninstalling certains apps, disabling real-time sync, etc.) - I find this compromise unacceptable, I bought this device to use it with all its glory.
- Using a larger extended battery - I find this solution unacceptable, since in order for a poweruser to get through the day, at least a 3000mah battery is required. Such a battery, although exist for the S2, adds significant weight and bulk. The device becomes ugly and uncomfortable to carry around.
- Upgrading to a device with much better battery life - currently there are two, the Motorola Maxx, which I find ugly, and the Samsung Note 2, which is realy big to handle...
So, after much thought and experimentation, I finally want to report my success story (yes it's an old solution, but somehow most don't understand its enourmous power): I'm using a secondary battery. I bought another original 1650mah battery (with a seperate charger). The 1650mah battery is very light and small, so it easily fits inside my very small wallet. When I need to switch (middle day), I clocked the switch at just under 60 seconds (from pressing the power off button, to being able to fully use the device again with a fresh battery including the rubber case installed).
This is such a simple solution, it has practically zero drawbacks (If you don't mind losing 60 seconds of your life everyday...), it gives you the equivalent of a 3300mah battery (which is much more than any extended battery advertized as being 3300mah, even Mugen's), yet so few people use it...

wowwww you wrote all this just to tell us you have a secondary battery.

I know, it seems like an overkill but really, I spent 1.5 years trying to solve the S2 battery problem without huge compromises (and everything else apart from a secondary battery is a huge compromise), and I can only regret I didn't read a post like mine...

u wasted ur 1,5 years for just a secondary batt??? do u know how funny u're...
how about having a micro USB powerbank??
Sent from my GT-I9100 using xda app-developers app

S 2's battery actually doesn't suck. It is better than most of android phones.
Sent from my GT-I9100 using xda app-developers app

Noam23 said:
I know, it seems like an overkill but really, I spent 1.5 years trying to solve the S2 battery problem without huge compromises (and everything else apart from a secondary battery is a huge compromise), and I can only regret I didn't read a post like mine...
Click to expand...
Click to collapse
samsungs 2000mah extended battery iis realy good its just pricey

Don't see how this 'sollution' is from a different category than the other ones you've stated.. It all depends on the user, and what he/she knows about saving battery without UC and stuff.
Maybe you would last longer with one battery if your stories would be shorter
Sent from the Matrix

Donnie Sins said:
Don't see how this 'sollution' is from a different category than the other ones you've stated.. It all depends on the user, and what he/she knows about saving battery without UC and stuff.
Maybe you would last longer with one battery if your stories would be shorter
Sent from the Matrix
Click to expand...
Click to collapse
I thought I made it clear why the extra battery is a solution of a different category
- It allows you to have all the phone's features ON.
- It allows you to enjoy its comfortable, light and slick original design.
- It allows you to enjoy the equivalent of a *true* 3300mah battery.
- Minimal fuss (60 sec battery switch).
Nothing can come close to such a solution (for a power user who needs a long lasting phone). Practically no drawbacks, only benefits (in comparison to any other solution, which always present a severe compromise).

I think it's rather a good advice, than a "solution". And indeed, this is a feature you will miss whent it's gone: The replaceable battery. I've bought the 2000 mAh battery by Samsung. So I have the greater battery plus a secondary one, if needed.

BAZZI_US said:
I think it's rather a good advice, than a "solution". And indeed, this is a feature you will miss whent it's gone: The replaceable battery. I boght the 2000 mAh battery by Samsung. So I have the greater battery plus a secondary one, if needed.
Click to expand...
Click to collapse
I agree, the word "advice" is more appropriate
Btw, are the 1650mah and 2000mah batteries interchangeable ? I thought they use different battery cover...

Noam23 said:
The Samsung Galaxy S2 has horrible battery life. The 1650mah battery will not suffice to anyone but light users.
In my eyes, there are many unacceptable solutions:
- Disabling battery hungry features (lowering screen brightness, undervolting CPU, uninstalling certains apps, disabling real-time sync, etc.) - I find this compromise unacceptable, I bought this device to use it with all its glory.
- Using a larger extended battery - I find this solution unacceptable, since in order for a poweruser to get through the day, at least a 3000mah battery is required. Such a battery, although exist for the S2, adds significant weight and bulk. The device becomes ugly and uncomfortable to carry around.
- Upgrading to a device with much better battery life - currently there are two, the Motorola Maxx, which I find ugly, and the Samsung Note 2, which is realy big to handle...
So, after much thought and experimentation, I finally want to report my success story (yes it's an old solution, but somehow most don't understand its enourmous power): I'm using a secondary battery. I bought another original 1650mah battery (with a seperate charger). The 1650mah battery is very light and small, so it easily fits inside my very small wallet. When I need to switch (middle day), I clocked the switch at just under 60 seconds (from pressing the power off button, to being able to fully use the device again with a fresh battery including the rubber case installed).
This is such a simple solution, it has practically zero drawbacks (If you don't mind losing 60 seconds of your life everyday...), it gives you the equivalent of a 3300mah battery (which is much more than any extended battery advertized as being 3300mah, even Mugen's), yet so few people use it...
Click to expand...
Click to collapse
you still have to carry the cover everywhere too.
Sent from my GT-I9100 using xda app-developers app

you really cant notice the samsung extended battery is any bigger, especially if you have a case on your phone then it is impossible to tell. Much better than carrying and charging two batteries imo!
I dont have the extended battery and when using my phone hard over the day i can get 5 hours screen time on standard size anker battery. Have you tried using BBS to workout why your battery life is soo poor?

Chanz09 said:
you still have to carry the cover everywhere too.
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
What do you mean "carry the cover everywhere" ? which cover ? I only carry the additional 1650mah battery in my wallet...

iamflamez said:
you really cant notice the samsung extended battery is any bigger, especially if you have a case on your phone then it is impossible to tell. Much better than carrying and charging two batteries imo!
I dont have the extended battery and when using my phone hard over the day i can get 5 hours screen time on standard size anker battery. Have you tried using BBS to workout why your battery life is soo poor?
Click to expand...
Click to collapse
But you can't compare two 1650mah batteries to one 2000mah battery... the 3300mah solution gives you 65% more juice...
Regarding carrying an additional 1650mah battery, it's so small and light (30 grams) that after putting it in my wallet I forget about it completely. Charging two batteries is no fuss at all, if you have a seperate battery charger.
You are getting 5 hours screen time on 1650mah battery ? for me this is impossible, while every feature is ON (real time sync, auto brightness, facebook app, normal volt, constant 3G connection) I get this amount from two batteries (but the phone operates much more than 5 hours, more like 20). I do have bad reception at my work, which might drain the battery more.

2000+1650 battery is better than your solution, lol

nevelast said:
2000+1650 battery is better than your solution, lol
Click to expand...
Click to collapse
And 2000 + 2000 is even better
But really, 3300mah is more than anyone would require in 1 day. It's really an overkill in itself (it's more than the Note 2 battery, and for a much smaller screen...).

you forgot the 1650 battery that came with the phone & money spent in vain?!

How do you charge both of the batteries? I mean you have one s2, or you use external charger to charge extra battery?
And My S2 lasts a day with 3hour of music, 4hour of screentime! No undervolting or compromise, Wifi n Data mostly on, I even use Google Now! Stweaks settings for best performance!

Sh4Dy said:
How do you charge both of the batteries? I mean you have one s2, or you use external charger to charge extra battery?
And My S2 lasts a day with 3hour of music, 4hour of screentime! No undervolting or compromise, Wifi n Data mostly on, I even use Google Now! Stweaks settings for best performance!
Click to expand...
Click to collapse
Yes, I use external charger to charge the extra battery ($10 on ebay), and another $25 for the extra original 1650mah battery.
I think the battery life has a lot to do with the signal quality, and the signal sucks at my workplace (also, if you are using WIFI instead of 3G you'll again save a lot in battery, but I'm using 3G...).

Noam23 said:
Yes, I use external charger to charge the extra battery ($10 on ebay), and another $25 for the extra original 1650mah battery.
I think the battery life has a lot to do with the signal quality, and the signal sucks at my workplace (also, if you are using WIFI instead of 3G you'll again save a lot in battery, but I'm using 3G...).
Click to expand...
Click to collapse
I use both, but mostly Wifi.
Edit: And I don't like keeping it on minimum brightness, it kinda changes colors in S Amoled. White seems yellowish, grey becomes something else, so I keep it around 35-40%

Related

Can acbPowerMeter be trusted?

Hi!
I have had my Tytn for roughly 2.5 years. This autumn/winter the battery time I could get out of my Tytn was really ridicilousley low, so I bought a new "non original" 1500 mAh battery. It got better but not much, I started to think that perhaps the battery time was never better than this.
The other day I skimmed through this forum about battery problems and found this little program for meassuring battery consumption. I have now had it on since I removed my phone from the charger this morning and now, 4 hours later I'm down to ~30% battery power and acbPowerMeter tells me that the phone has used 90 mAh all together.
I have made 1 shorter phone call and made a couple of synchs with turbo 3G during this period.
Does 90 mAh sound at all right? That would mean that the battery was crap to begin with....or is it possible that acbPowerMeter isn't giving me even "close to correct values"?
Does anyone have any comments or ideas around this issue?
Best Regards,
Olle
Don't know anything about your abcpowermeter. What I do know, is that when I've had a new battery, or when I flash a new ROM, I often have problems with low battery. I just run the battery down like three times in a row, and my battery always improves.
So before making any determinations or using a program, I always run the battery down.
I've got acbpowermeter on my phone, and I don't think it's much good to be honest. If I remember correctly, the last time I left it running, it severely drained my battery - not exactly what you want a power meter app to do.
I find it far more reliable by using BatteryStatus from chi-tai.info and just seeing what the momentary power usage is. (it sits on your Today screen). Yeah, it's not a comprehensive breakdown of your power usage over time, but it doesn't run the battery down like acbPowerMeter does
Like you though, I'm still curious as to what exactly my device consumes in terms of power over the course of a single charge, and I'm on the look out for a decent app which just ticks away in the background measuring power drain...
Hi!
Regardless of Acbpower I just bought a new HTC Original battery and now I have the "normal" battery life I was used to during the first year of my device. As it has allready been discussed in other threads: These non-original batteries are far from always a safe purchase...
Br, Olleman
I recommend Lion Batteries. I have had a great experience with their 3000mAh battery for over a year and a half. Use that 3G on my Hermes and music all the time -- serious user-- and the battery still last me over day. Mind you I am constantly on the internet and always using push email and other data-centric services.
As far as Battery Status, for general purposes is great as I find the more complicated the app the more drain on the system it is trying to read. A simple app that you can just keep an eye over a period of time I think works best.
As far as batteries I was concerned where to buy one. Since my brand new battery died over just a year. Mind you a tethered a lot and I think that tends to kill the battery life faster.

Battery Options for EVO

So right now I have some choices:
Go with a Seidio Innocell 3500mAh that will be about 60 bucks through Amazon that has a massive hump in the back.
Go with a solar power battery of some sort (they have 3500 mAh batteries online)
Go with cheap backup batteries.
Try recharging the battery in the method that HTC recommended.
What do you guys think?
Just curious...why? As a backup or did you have a problem with your battery?
I'd cop an extra battery, I hate the added bulk but that's just me.
beesneazy said:
I'd cop an extra battery, I hate the added bulk but that's just me.
Click to expand...
Click to collapse
+1, they are not expensive either, though I do think the actual EVO battery cost more than a Touch Pro or TP2 battery, which, by coincidence, are the same as the stock EVO battery....
I want a new or extra battery because:
Even with all the phone setting tweaks, my battery life is still pathetic. I want something I can run the phone normally with, without having to worry about my battery going dead.
And my phone did not receive the new update, which supposedly helps the battery life out.
nbakid2000 said:
I want a new or extra battery because:
Even with all the phone setting tweaks, my battery life is still pathetic. I want something I can run the phone normally with, without having to worry about my battery going dead.
And my phone did not receive the new update, which supposedly helps the battery life out.
Click to expand...
Click to collapse
How bad battery life you getting? I am able to get around 12-15 hours of use which is pretty good for me.
It seemed to be doing better, lasting longer than before but today, I pulled it off the charger, it was at full battery. Then I had it sit there for about an hour and half maybe (doing nothing) and I looked and all the sudden it's down to just over half battery life.
I'm not sure what's going on. Before the Network setting change, I couldn't even use the phone for 20 minutes without the thing dropping to 75% charge. After that it lasted much much longer, except for today.
Jye75 said:
+1, they are not expensive either, though I do think the actual EVO battery cost more than a Touch Pro or TP2 battery, which, by coincidence, are the same as the stock EVO battery....
Click to expand...
Click to collapse
hah yeah , definitely need to get an extra battery. I want a yellow battery like in that HD Mini!
I am convinced that there was a bad batch off Evo batteries. You might find that another 1500mah solves your issues.
Also, be careful with the 3rd party 2000mah battery as it is reported to have a real world capacity off approx 1100mah!!
-------------------------------------
Sent via the XDA Tapatalk App
nbakid2000 said:
So right now I have some choices:
Go with a Seidio Innocell 3500mAh that will be about 60 bucks through Amazon that has a massive hump in the back.
Go with a solar power battery of some sort (they have 3500 mAh batteries online)
Go with cheap backup batteries.
Try recharging the battery in the method that HTC recommended.
What do you guys think?
Click to expand...
Click to collapse
60 will get you 12 aftermarket tp2 batteries and 6 multi function battery chargers, batteries rated at 1500 but I don't believe they are actually that high, I'm standing at 7 hours of above moderate use on one, would easily last me through a day of work at normal use. THIS IS OFF EBAY. These batteries have not been conditioned by me yet, so I'll do that and test again.

Qns related to buying new HD2 battery?

How often do you change your HD2 battery? when do you know you need to change it? sorry if this sounded silly!
Well, Ive had mine since november 09 and never changed it. Still holds a decent charge, probably not quite as much as when it was brand new but cetainly not a noticeable difference.
when to change batts.
Typically a li-ion battery will lose 20% of its capability after one year (even if you don't use it) A few things can influence the exact amount (keeping it always at 100% will speed up the loss, as will high temperatures)
If you really want to know exactly what the loss is.....
Fully charge a battery and remove it. Leave it a few hours or overnight and then use a voltmeter to see what the voltage is. This will tell you how much capacity it has lost.
4.18v -4.2v=100% (ie perfect battery)
4.10v = 87%
4.0v =75%
cottonpickers said:
Typically a li-ion battery will lose 20% of its capability after one year (even if you don't use it) A few things can influence the exact amount (keeping it always at 100% will speed up the loss, as will high temperatures)
If you really want to know exactly what the loss is.....
Fully charge a battery and remove it. Leave it a few hours or overnight and then use a voltmeter to see what the voltage is. This will tell you how much capacity it has lost.
4.18v -4.2v=100% (ie perfect battery)
4.10v = 87%
4.0v =75%
Click to expand...
Click to collapse
I have a an old magician I bought new 8 years ago & still works with original battery.
My touch pro is almost 3 years old & still works fine lasting 2 days on energy ROM with original battery & the same can be said for wifes old Diamond 2 Topaz.
Doing output test & using HTC battery test exe may help determine battery condition if battery is suspected faulty.
My conclusion is a genuine good battery should see over 2 to 3 years use without noticeable performance loss & have a serviceable life beyond 5yrs.
Modern devices such as HD2 which has a small battery & drains a lot of power so may lower the battery lifespan as you will be charging that tiny battery almost twice as often, also current battery material quality may have declined.

Imagine a Longer Lasting Note

Suppose you had a choice, the Note as it is with 2500ma battery, or my imaginary 6000ma Note. (see attachement).
2500ma to get you through a day with moderate use, or 6000ma for a day of unworried heavy use. (or two or three with normal use)
Kind of difficult without knowing the thickness of your imaginary Note. In any case, one of the reasons the Note's size is so manageable is because of how thin it is.
Considering that I get a full day (~12hrs) out of even heavy use with my note and 35+ hours with normal use, I cant really think why anyone would want to make this have a larger battery...
Using juice defender ultimate and 15% screen brightness.
Also, I cant believe most people dont realize that those crap mugen and other extended batteries are ususally nowhere near their advertised mAh rating. http://batteryboss.org/
A total scam and making people use bigger phones for practically a placebo effect battery life increase.
Aside from the scams...
I would like an official larger battery, fitting in a bit thicker case, this would make it really my dream phone.
My day lasts a bit longer than 12hrs...
I also use Juice Defender, but this just helps when you are not using the phone....
Interesting, but I use an external USB battery pack. This means the phone doesn't have any extra weight. Sure, I have to carry an extra gadget, but it's only when I need it and they make them in all sorts of sizes so it's not much of a compromise.
I think, there is certainly space for a bigger battery, considering it is almost same hardware inside on the S2 it should be plenty of room for a bigger battery. Maybe they could used a bigger battery which was thinner...anyway..if you could always have two batteries an extra battery in your pocket... the battery does not cost much..
But yeah I like if you had the choose to buy a bigger battery like on your picture, and then buy a new back case..
I am happy with the thickness as is and wouldn't want to increase it. I can always use titanium to freeze any apps that I require for little extra reach anyways.
I don't need a 6000mah battery
randomstranger99 said:
Interesting, but I use an external USB battery pack. This means the phone doesn't have any extra weight. Sure, I have to carry an extra gadget, but it's only when I need it and they make them in all sorts of sizes so it's not much of a compromise.
Click to expand...
Click to collapse
+1
and so far I would say the Note has better power consumption vs. battery size than my SGSII did.
SNiiPE_DoGG said:
Considering that I get a full day (~12hrs) out of even heavy use with my note and 35+ hours with normal use, I cant really think why anyone would want to make this have a larger battery...
Using juice defender ultimate and 15% screen brightness.
Also, I cant believe most people dont realize that those crap mugen and other extended batteries are ususally nowhere near their advertised mAh rating. http://batteryboss.org/
A total scam and making people use bigger phones for practically a placebo effect battery life increase.
Click to expand...
Click to collapse
Is that really true? I don't get the impression from the other battery life thread that the Note can last an entire working day without dying. If that's possible then great, but I would appreciate if you can provide just a bit more details about your usage. Let's put it like this, will the Galaxy Note last from 8 AM to 8 PM with my defined usage pattern listed below.
I don't need a battery that will last 2 or more days. I need a phone that will work permit hours of web browsing, 4 push e-mail accounts, and instant messaging running in the background. My iPhone 4 will easily last the entire day thank to the battery case. If it wasn't for my Mophie case, then I wouldn't be able to do it.
Is 15% brightness adequate?
Right.
I had a mophie for my iPhones, a battery pack for my S2, and would like a longer lasting Note. Especially for the Note, since its size invites to keep my desktop turned off.
But the battery included with the Note doesn't survive a whole day of heavy use, just moderate use.
So you have to revert to Juice defenders, mophies and keep an eye on the battery, carry chargers etc.
It would be, at least for me, very convenient and relaxing to have a phone where you don't need to think about power management.
And I think I am not alone.
It would be easy for Samsung to make a longer lasting phone, and it would sell.
Sent from my GT-N7000 using xda premium
Make 2 versions, 2500 and 5000 for instance....let the people decide !!!
I use my note alot during my workdays. And it last my 8 hour day easy with realy heavy use.
But like today when ive been busy with my machine at work ive just had radio on the whole day and maby got around 1-2 hour of browsing, watching movie, gaming, etc. And after 8 hours my battery is on 75%.
Whats draining most of my battery is the connection with the 3g network and syncing. Using my msn app the whole day will make it drain alot more.
And the screen. If you have the screen on alot it will drain the battery realy fast with high brightness. So the lower you can have the better. The difference between 75% and 25% is huge for me.
And for those that will have more battery power i think a external batterypack is pretty good solution. Ive one for backup for times when i know im going to use my phone much during a long time without the possibility to charge.
Can have my batterypack in my pocket while i use and charge my phone.
a little too thick from the picture but would be nice if the same thickness then i'd go for the 6000ma one or just get another spare battery for the heavy use .
lsquare said:
Is that really true? I don't get the impression from the other battery life thread that the Note can last an entire working day without dying. If that's possible then great, but I would appreciate if you can provide just a bit more details about your usage. Let's put it like this, will the Galaxy Note last from 8 AM to 8 PM with my defined usage pattern listed below.
I don't need a battery that will last 2 or more days. I need a phone that will work permit hours of web browsing, 4 push e-mail accounts, and instant messaging running in the background. My iPhone 4 will easily last the entire day thank to the battery case. If it wasn't for my Mophie case, then I wouldn't be able to do it.
Is 15% brightness adequate?
Click to expand...
Click to collapse
It's completely true, once you set the phone up right it has incredible battery life. I'm not talking setting the phone up to be crippled like I have had to do with previous android phones either, this thing just goes. After a day (9hrs) of normal use in my office (texting, surfing and using reddit is fun) My battery was at 80%
People dont set up their phones right, and/or complain about the battery life after spending all the first day with the phone downloading apps and gazing at the beautiful screen are the ones misleading saying this phone has bad battery.
robertsydbrink said:
I use my note alot during my workdays. And it last my 8 hour day easy with realy heavy use.
But like today when ive been busy with my machine at work ive just had radio on the whole day and maby got around 1-2 hour of browsing, watching movie, gaming, etc. And after 8 hours my battery is on 75%.
Whats draining most of my battery is the connection with the 3g network and syncing. Using my msn app the whole day will make it drain alot more.
And the screen. If you have the screen on alot it will drain the battery realy fast with high brightness. So the lower you can have the better. The difference between 75% and 25% is huge for me.
And for those that will have more battery power i think a external batterypack is pretty good solution. Ive one for backup for times when i know im going to use my phone much during a long time without the possibility to charge.
Can have my batterypack in my pocket while i use and charge my phone.
Click to expand...
Click to collapse
I agree that using 3G will drain the battery faster, but I didn't subscribe to adapts connection and then exclusively use wifi.
Is 25% screen brightness adequate for outside viewing?
---------- Post added at 01:18 AM ---------- Previous post was at 01:16 AM ----------
SNiiPE_DoGG said:
It's completely true, once you set the phone up right it has incredible battery life. I'm not talking setting the phone up to be crippled like I have had to do with previous android phones either, this thing just goes. After a day (9hrs) of normal use in my office (texting, surfing and using reddit is fun) My battery was at 80%
People dont set up their phones right, and/or complain about the battery life after spending all the first day with the phone downloading apps and gazing at the beautiful screen are the ones misleading saying this phone has bad battery.
Click to expand...
Click to collapse
I totally appreciate your feedback here, but can you be specific about the settings that you're using to achieve such great battery life?
Is 15% brightness enough for outside viewing?
Also interested in what "set the phone up right" means
All of above that, you need to find a good kernel to be developed.
Sent from My Galaxy S II Using Tapatalk

[Q] Extended Battery, show of hands who uses them?

I have them on my Note2 my S4 and my Galaxy Nexus
Idk how i could ever have another phone without them.
The reasons i ask this is because i don't think any builder will ever put a big enough battery to really make it count because of the thickness.
Hats off to Moto for being bold, but still we need 5000mah for good measure.
What is your take community? Do you like Phones that last for DAYS!?
My phone lasts for a full day, and I prefer to charge nightly. My bigger problem anymore is that I prefer to charge when the battery level is in the teens or lower, and it takes some effort to get it to drop that far in a full day's usage. Having a larger battery, especially when sacrificing aesthetics isn't something that I want. Especially when it makes it harder to find decent cases.
I've always just carried an extra battery in my pocket. It only take a minute or so to swap them, and that way the phone isn't any thicker in the hand.
mattdm said:
I've always just carried an extra battery in my pocket. It only take a minute or so to swap them, and that way the phone isn't any thicker in the hand.
Click to expand...
Click to collapse
But the pocket is thicker
Ontopic I would use a nice case + battery combo that looks good but for now the battery life is just fine for me.
I use this http://www.samsung.com/us/mobile/cell-phones-accessories/EB-K600BUWESTA I got it for $25 when samsung had the 50% off coupon. Comes with an extra battery, downside is it take close to 5 hours to charge and sometimes ill forget and overcharge the battery. imho its the best accessory i have bought
RoboDroid13 said:
But the pocket is thicker
Ontopic I would use a nice case + battery combo that looks good but for now the battery life is just fine for me.
Click to expand...
Click to collapse
If I had an extended battery, my pocket would be thicker anyway!
I don't have an extended battery, but I have 2 extra backup batteries that are always fully charged before I go out in my pocket. Does that count?
Sent from "Michael's Galaxy S4"
Went with Ankor's kit that gave me two extra standard batteries and a external charger. I always keep one extra battery on me, one in the phone, and one in the charger (till fully charged). Rotate them for even use. I always let them dip to 10% at least before changing. One usually lasts me a full 24 hours. Usually 50-25% by the time I go to bed. Then I use the rest up in the morning checking news before i get my lazy self out of bed.
Currently I am between the stock battery and my zl 7500. When I had the Note 2 I never even looked for an extended battery because I was always good for power. With the S4 I can still make it the entire day on stock battery but to me I always worry when the battery gets to 30 percent.
So if I like playing games that day I put in the ZL and I don't worry. When I am working in typically just stick with stock because it lasts.
For me I think 4000 would be perfect for stock. 3 years we will be there.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app

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