bruce
in todays technology, our battries weighter in phone / others, are made from lithium etc...
these battries can be easly damaged. >
1) Once a charged battry is droped down, the battry's charge will split, the (+) and the (-) which will make is to lose the power evern after been fully charged.
2) droping or exposing to heat, may break the cells in the battry causing in to grow big, and is likely to lose it's function.
3) Over charging will manuplate the battry, it will reiceive too many electrical charge but there will be no cell to hold them so it is likely to increase in size / break the cells.
4) Using the wrong charger,
this will only fastern / slowern your charging period.
5) Using battry in radio-active areas, this will indireactly damage your battry, by causeing the + and - to fuse with more force, and thats your battry will produce lots of electric, which will make your phone burn down. ( this has happerned to me once)
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bruce