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Mod a 9V rechargeable battery to give you +3.6V, Ground and -3.6V.You will appreciate this idea if you ever had to clobber together a bunch of AAs or ...
Take a long nose plier and gently apply pressure at the top seam. The case will crack open revealing a surprising inside. There are seven 1.2V NiMH batteries ...
Ok, so know you have a 7.2V battery, big deal! ...and you can't even recharge it because the charger delivers 9V and might explode the batteries. Ok so ...
Look at the pretty light when your battery is charging.It is possible to recharge the battery while connected to your project. However make sure you have big capacitors ...
You can put back the assembly in the original 9V package. I made a hole for the LED and a hole in the back for the wires.
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