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Old July 6th, 2011, 05:52 AM   #46 (permalink)
spy2jgc
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Default Is it the Voltage.... or is it just naturally warm?

Part of this is technical, but it helps to understand that heat is NORMAL, but excess heat and/or voltage is NOT... your phone/battery might be running hot, but it doesn't necessarily mean you have a voltage problem. Knowing the MAX voltage that your battery is reaching while charging is important, and remember, max voltage is not reached until the battery is usually over 80% charged. If your battery or phone is getting warm but NOT EXCEEDING 4.2 Volts at anytime during charge, it shouldn't be a voltage issue.

Wikipedia:

High charge levels and elevated temperatures (whether from charging or ambient air) hasten capacity loss. Loss rates vary by temperature: 6% loss at 0 C (32 F), 20% at 25 C (77 F), and 35% at 40 C (104 F).
(Many) Lithium-ion battery packs contain fail-safe circuitry that shuts down the battery when its voltage is outside the safe range of 34.2 V per cell. ....3.7 V nominal voltage with a 4.2 V max charge.

Typically, lithium-ion cells are charged with 4.2 0.05 V/cell.
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