The battery OUTPUT is supposed to be 3.7 volts... but that shouldn't be directly associated with how much INPUT it can handle. Sure they're connected, but not in the way you're implying.
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Originally Posted by jumbuck
I am in in the process of changing my battry and my theory is ... (1)The battery is 3.7 volts, the charge is 5 volts and the battery is sealed. (2)The higher the voltage difference the higher the current flow and the faster the charge . (3) The faster the charge the more heat is generated. (4) The larger the battery capacity the longer the charging peroid the more heat is generated.(5)Heat=ex pansion therefore the more heat the more expansion. In therory slowing down the charge rate and providing better cooling for the battery should avoid this problem. I am going to put heat sink paste between the battery and case and either fit a diode(to reduce voltage 0.5 volts) or a resitor (to reduce current flow) in series on 1 of the charge wires from the transformer. Also charging with the player in a cover will reduce the batteries abilty to cool. Anotherway which might possibley help is to charge a flat battery in stages instead of one long charge thus allowing the battery a chance to cool down. No garanties on my therory but I'm sticking with it. this may even help to increase battery life by not over heating the battery.
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