I got an extended 2400mah battery from ebay (they are very cheap !) and i gave it a visual inspection, they seem very well built and so far run very nice and cool in the phone.
The only issue is the linux android kernels are reporting it as a "standard" battery !?
I have done the proper rm /data/system/batterystats.bin and then shutdown and fully charge the battery with phone off and then boot up so set the "top barrier" so i can charge correctly in android, but how am i supposed to get a reliable discharge reading ?
i have hammered my phone all day and im down to 15% now, but the battery voltage is still up at 3.795
according to the LI-ION battery discharge curve 3.8 = around 50% battery life still available.
Am i really at 15% ?
-Edit
LOL !!! i read on another thread that someone shut down the phone and remove the battery, then put it back in and load back up and got another 50%, i just tried this and now i have 70%.
Hilarius !
Visentinel said:
I got an extended 2400mah battery from ebay (they are very cheap !) and i gave it a visual inspection, they seem very well built and so far run very nice and cool in the phone.
The only issue is the linux android kernels are reporting it as a "standard" battery !?
I have done the proper rm /data/system/batterystats.bin and then shutdown and fully charge the battery with phone off and then boot up so set the "top barrier" so i can charge correctly in android, but how am i supposed to get a reliable discharge reading ?
i have hammered my phone all day and im down to 15% now, but the battery voltage is still up at 3.795
according to the LI-ION battery discharge curve 3.8 = around 50% battery life still available.
Am i really at 15% ?
-Edit
LOL !!! i read on another thread that someone shut down the phone and remove the battery, then put it back in and load back up and got another 50%, i just tried this and now i have 70%.
Hilarius !
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Click to collapse
What did you have to edit to get Android to do proper readings on the extended battery?
i charge my batter to 100% then leave the charger connected for another 4 hours. when i unplug, my battery reads 100% for about 3-4 hours then its starts to discharge....
how do i match the level of the battery with the android readings?
I have the seidio 3500 mah and love, especially after I found out how to manage it properly. Couple tricks with these larger batteries are as follows. This should work with all larger batteries.
1. When the charging light turns green, the battery is only at 1500. Keep on charge for about 3 hours longer or more to get full charges.
2. Wipe battery stats. Recovery, advanced, wipe battery stats. When you hit go, screen will go black for about 30 seconds. It's o.k. it's doing the wipe.
3.Condition the battery. Charge all the way, let run down completely till phone dies. Then charge all the way again. Do this bout 3 times. Should condition about 0nce a month to prolong battery life.
Follow these steps and you will love your big battery. I love mine. My Seidio runs bout a day and a half and I am constantly doing stuff with the phone. ENJOY!!!!
Ok are you using juice defender for it or any application that save battery life
Sent from my PC36100 using XDA App
Nope, I only use task killers that can auto kill when screen turns off. Also, Itry to leave GPS turned off unless I need to turn it on. I just do as I posted origanally and it works great. I do keep my origal batt and back door available so when the batt gets low I can just run it completely dead. Oh yeah, I also have a spare batt charger the just charges the batt by itself.
squick said:
Nope, I only use task killers that can auto kill when screen turns off. Also, Itry to leave GPS turned off unless I need to turn it on. I just do as I posted origanally and it works great. I do keep my origal batt and back door available so when the batt gets low I can just run it completely dead. Oh yeah, I also have a spare batt charger the just charges the batt by itself.
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Don't do it!!!! Task killers are horrible for any phones running FroYo.
How come? It has never seemed to effect it.
kse91holydiver said:
Don't do it!!!! Task killers are horrible for any phones running FroYo.
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Some apps hang so it helps to use a task killer, I exclude the apps that usually start in their own. I also noticed after I close everything after a reboot, the phone runs much smoother with just the necessary apps running.
squick said:
1. When the charging light turns green, the battery is only at 1500. Keep on charge for about 3 hours longer or more to get full charges.
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Click to collapse
That makes no sense. When the light is green, the battery is at 4.15-4.2 V, and it's no longer charged at this point.
Task killer should only be used if an app hangs, not set to automatic kill, android does this on it's own. GPS only turns on when an app needs it so turning it off does nothing. I get a full day and a half on a standard battery with Wifi on, GPS on and juice defender set to every 15 minutes which I'm now turning off due to facebook app and push notifications.
Sent from my PC36100 using XDA App
DirtyShroomz said:
Task killer should only be used if an app hangs, not set to automatic kill, android does this on it's own. GPS only turns on when an app needs it so turning it off does nothing. I get a full day and a half on a standard battery with Wifi on, GPS on and juice defender set to every 15 minutes which I'm now turning off due to facebook app and push notifications.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
So you can leave GPS on and its not killing the bat unless your running a gps intensive app? I had no idea....
Thanks
JP
nabbed said:
That makes no sense. When the light is green, the battery is at 4.15-4.2 V, and it's no longer charged at this point.
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The voltage isn't the the same as amps. When the batt is at 1500 it still has the proper voltage to run the phone but the cells are not full. The EVO is set to turn the light green when the batt is at 1500. I found this to be true cause when I first got the batt I would charge till it turned green then off I went. I wasn't getting any better batt life until I found info on how to properly charge these batts. Now I get bout a day and a half.
Squick is right. Let it charge for another few hours after it goes green for the extended battery from Seidio. If you unplug it right after it hits 100, it'll drop to 75 pretty quick. So let it keep charging.
squick said:
The voltage isn't the the same as amps. When the batt is at 1500 it still has the proper voltage to run the phone but the cells are not full. The EVO is set to turn the light green when the batt is at 1500. I found this to be true cause when I first got the batt I would charge till it turned green then off I went. I wasn't getting any better batt life until I found info on how to properly charge these batts. Now I get bout a day and a half.
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The charging circuit has no way of the determining the charge capacity. The only property that can be measured is the voltage, and consequently the rate at which voltage is changing and the current during charging.
If the charging circuit relied on capacity, you'd never be able to charge past 1500mah.
The basic process is to charge at constant current until each cell reaches 4.2 V; the charger must then gradually reduce the charge current while holding the cell voltage at 4.2 V until the charge current has dropped to a small percentage of the initial charge rate, at which point the battery is considered 100% charged. Some manufacturers specify 2%, others 3%, but other values are also possible.
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http://en.wikipedia.org/wiki/Lithium-ion_polymer_battery#Charging
nabbed said:
The charging circuit has no way of the determining the charge capacity. The only property that can be measured is the voltage and the rate at which voltage is changing during charging.
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After all that I have read and personally tested, the battery is not fully charged when the light turns green. I have taken the phone off charge once the light turned green and the battery lasted no longer than a 1500. I found numerous threads that stated that the evo goes green once the battery reaches the 1500 point and that you need to charge well past the green full light. Once I started letting it charge at least 3 hours over, I get awesome battery life. If there is another explaination for this I would love to know!
squick said:
After all that I have read and personally tested, the battery is not fully charged when the light turns green. I have taken the phone off charge once the light turned green and the battery lasted no longer than a 1500. I found numerous threads that stated that the evo goes green once the battery reaches the 1500 point and that you need to charge well past the green full light. Once I started letting it charge at least 3 hours over, I get awesome battery life. If there is another explaination for this I would love to know!
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Click to collapse
Try this:
1) Charge the phone till the light goes green.
2) Power off the phone completely (shut down).
3) Charge more with the phone being off until the light goes green again.
I'm guessing the extended battery like 3500mAh should be nearly fully charged at this point, and it shouldn't take more than 30-45 minutes for the second charge, as opposed to 3 hours.
The reason for this behavior, and I'm guesstimating here, is that HTC optimizes charging in the kernel to never exceed a certain limit, which is very close to 90-95% charge. A double capacity battery, having a different charging rate and the limit current, should be at 80-90% - double the difference - when charged with the phone on. Eliminating this optimization from HTC by charging with the phone off should, in principle, allow faster charging to nearly 100%.
squick said:
3.Condition the battery. Charge all the way, let run down completely till phone dies. Then charge all the way again. Do this bout 3 times. Should condition about 0nce a month to prolong battery life.
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Nonsense! The Evo uses a LiPo battery and there is no beneficial reason whatsoever to running the battery down. In fact, running the battery down unnecessarily will reduce the cycle life and the calendar life. In the simplest of terms, the LiPo cell chemistry is only capable of so many charge-discharge cycles before it loses significant ability to store energy and unnecessary cycles just use 'em up unnecessarily.
In fact, a bunch of partial charge-discharge cycles are a lot easier on LiPo cells than a few full charge-discharge cycles. In other words, your battery will remain healthy a lot longer if you charge it whenever you can instead of waiting until you have to all the time.
Pete
PGRtoo said:
Nonsense! The Evo uses a LiPo battery and there is no beneficial reason whatsoever to running the battery down. In fact, running the battery down unnecessarily will reduce the cycle life and the calendar life. In the simplest of terms, the LiPo cell chemistry is only capable of so many charge-discharge cycles before it loses significant ability to store energy and unnecessary cycles just use 'em up unnecessarily.
In fact, a bunch of partial charge-discharge cycles are a lot easier on LiPo cells than a few full charge-discharge cycles. In other words, your battery will remain healthy a lot longer if you charge it whenever you can instead of waiting until you have to all the time.
Pete
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Agreed. The only reason to discharge the battery completely might be to reset the battery calibration data and to recalibrate. But I really don't know if that even works.
Just saw the posts. I did not know that, but the rest still seems to work. If I charge the vary well past the green light, I get almost 2 days of use out of it.
Sent from my PC36100 using XDA App
I need testers for my battery fix that in theory, should charge all batteries (stock and extended) to maximum capacity. So far I tested it with a stock battery and it only lost 4% in an hour after being on the charger for 2 hours. Im testing my extended battery right now(it's only 1800mah).
here's the thread: http://forum.xda-developers.com/showthread.php?t=876590
Don't be stupid and fall for this trick. It's only prank in case noobs don't know. A day and a half is normal for 3500MAH battery with full use ( abuse the hell out of it ).
I think nabbed has got it, your battery loops once it gets to the max the battery can hold. Its megahertz, not amps or volts.. Your phone tries maintaining 100% by letting itself lose power and have to charge back up. Like I said, its a loop pattern.
Dear readers,
I am going to buy a new battery for my HD2 but there is a problem.
I would need to train the new battery and charge it full the first time without turning on the HD2 right?
How can i do this when my HD2 keeps turning on by itself? I even think my phone charges when it is off?
My phone runs ics 4 with magldr.
Can anyone help me out?
Just drain the battery normally and charge it when you sleep?
Draining a new battery will make it unusable???
No it will be fine, Li-ion are quite durable & do not have charge state preferences.
Just buy a new battery & put it in your HD2 & use it normally, if charge very low when first turn it on > plug it in & charge to full.
Then why do people and retailers keep advising me to fully charge batteries before first use?
Cause batteries don't come fully charged?!
But if you charge it first how do you know the battery is fully charged without draining it first since battery stats are incorrect?
Hmmm, i have been told that fully charging it at the first time before first use gives u better battery performance and better battery stats. U are telling me the opposite thing lol? You could see it is full by the constant green led? But if it is like you are telling me then that indication would be false?? Do i get it right?
A new batteries capacity should increase after first few cycles as will devices calibration of the new cell.
The Battery itself is dumb & you can use what method you like really with li-ion cells to charge them.
Only issue sometimes seen is devices recognition of cell power level is not shown correctly.
Have recently issued 20 new cells for our HD2 fleet, staff use them as they needed & without stringent charge routines & all is fine.
A little common sense is all that is needed & maybe calibration reset if a problem appears.
4rjan said:
Hmmm, i have been told that fully charging it at the first time before first use gives u better battery performance and better battery stats. U are telling me the opposite thing lol? You could see it is full by the constant green led? But if it is like you are telling me then that indication would be false?? Do i get it right?
Click to expand...
Click to collapse
What if you get a fake/defective battery that only holds 40% capacity and reports that as 80% and you charge the battery to report 100% (which activates the green led). How would you find out that this battery is holding a real 100% charge without draining it first?
With an app that shows u the amount of mAh?
Or is that impossible?
Any app calculating mAh will need a few cycles of the battery to give an accurate estimate. Reading any data direct from a cell is pointless as the cheap cells use chips to display false capacities.
In your circumstances just install new battery & charge while device is on then charge as required & only worry if run time seems very bad.
4rjan said:
With an app that shows u the amount of mAh?
Or is that impossible?
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Click to collapse
Now thats major bull. No app can give 100% correct info about battery capacity.
The only one method of correctly defining battery capacity is by using computerized battery analyzer.
If you want to get most of your new battery(Li-ion/poly):
-first make several charge/discharge cycles(after 5-10 you will get desired OEM capacity)
-charge it with wall charger, do not charge through USB
-charge it whenever you can, even if few % are only used
-avoid complete battery discharge(Lithium cells hate complete discharge!)
-keep it at reasonable temperatures, dry
-and don't buy cheap/promising alternatives. Only OEMs are worth buying. Forget about Mugen Magic(proof: www.batteryboss.org)
Battery apps are not always acurrate. They only measure in certain intervals (and then estimate the other stats), which only tells you the current in that instantance of time and the rest is ignored. Also if you undervolt, sometimes the drain measured higher than usual and the battery percentage becomes erractic (ie increasing after a reboot) that will easily change the estimated capacity.
Guys! I just got my new HETP 6800 Mah Extended Battery today. I'm just wondering if I need to calibrate the battery for the first time. I have read in several reviews of other extended batteries that the battery should be drained completely before charging the for the first time and it should be repeated to 3 times in order to calibrate the battery. Is it advisable to do that?
Ps: I don't trust those battery calibration app so please refrain from recommending them.
Did it anyways lol. Although I got a strange issue when the battery is on 30%,the battery is draining fast but when on 2% it takes 2 hours to discharge the battery even mobile data is on. It is so weird. How do I calibrate the battery percentage? Please help.