Your battery is most likely a litium-ion battery.  The best way to charge  lithium-ion cell phone batteries is when they are 2/3 to 3/4 depleted.  It is the older nickel type batteries that should be fully depleted before recharging.  Like one of the other posters said...it is best to put on charger … Read more

You should never freeze a cell phone battery.  It can ruin your battery!  For instructions on properly caring for your cell phone batteries visit the Battery Guide on www.batteries4less.com

If your cell phone battery is heating up then something is wrong with the battery or the charger.  Cell phone batteries tend to swell and can actually pop off the back of your phone if you don't replace them.