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Gary L · 25-01-2014, 11:53

If it's dead at 40% then it's probably a duff battery. the mAh of the battery is probably not at max capacity.

the mail app/location services can be a big drain on the battery. as well as any apps running in the background.

if the phone was jailbroken you could install 'battery detective' and as from my ipad it will tell you

Current capacity - 1260mAh
Max capacity - 4343mAh
Design capacity - 4490mAh
Battery charge - 27.95%
Drain - -465mA

So your Max capacity could be really low compared to the Design capacity.

But saying that. on one of my iPhone 3GS's that has a low max capacity. but it just drops rapidly down the bottom end. it wouldn't say 40% and be actually 2%.

25-01-2014, 11:53	#5
Gary L cf.mega poster Join Date: Sep 2007 Posts: 16,325	Re: iPhone battery problems If it's dead at 40% then it's probably a duff battery. the mAh of the battery is probably not at max capacity. the mail app/location services can be a big drain on the battery. as well as any apps running in the background. if the phone was jailbroken you could install 'battery detective' and as from my ipad it will tell you Current capacity - 1260mAh Max capacity - 4343mAh Design capacity - 4490mAh Battery charge - 27.95% Drain - -465mA So your Max capacity could be really low compared to the Design capacity. But saying that. on one of my iPhone 3GS's that has a low max capacity. but it just drops rapidly down the bottom end. it wouldn't say 40% and be actually 2%.