Li-ion battery adapter (AA size)
thingiverse
You can harness the power of an AA size Li-ion battery pack by using two AA sized batteries. Initially fueled by a 3V device (Li-ion battery 3.7V), the voltage needs to be lowered by 2 diodes. Choose any minimum 1A diode, such as the 1N4001. When assembling, ensure that the diodes conduct from negative to positive.
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