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How to reuse old tablet battery for a usb PowerPack

Hi, i have two 3600mah batteries from an old chinesse tablet, I would like to use as an portable battery pack for charge a cellphone.
i searched for similar instructable but i have no find anything, what is the next step


Picture of How to reuse old tablet battery for a usb PowerPack

Well if you have the charge circuit for the tablet so you can recharge the battery as needed then it can easily be made into a backup battery for your phone. Just buy this Minty Boost kit and use that battery instead of a pair of AA batteries and your all set.