IBM thinkpad a21e series battery can best replacement for the OEM thinkpad a21e series batteries !
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How to test battery life?
I recommend the right method to know how long will notebook batteries be used, that's make use of the BatteryMark4.0.1 software to test your ibm notebook batteries.
How to choose a notebook batteries?
You'd better choose the same type battery for exchange.In oder to make notebook computer battery have a longer power supply time,you can choose lithium battery recommended by manufacturer or following the pc vade mecum.