The86d,
Lithium ion, polymer, iron, magnese, etc... Do not wear down from being depleted like nimh batteries do.
Lithium batteries are worn down from a large amperage draw sustained for more than a few seconds.
A lithium battery pulling beyond its capacity will be worn down very quickly. Usually measured in C. Which means a 2000mah battery providing 4 amps would be 2C, 2amps would be 1C so on and so forth.
Bad lithium batteries is always a symptom of bad charge controllers, don't leave your phone on the charger once it hits 100%, and drain it fully each time and you will get many years out of that battery.
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