>>1620176I like those $5 power banks because it’s just a 20650 cell (3750mAh) plus a little USB protection board. You can rip them apart and the cell drops in perfectly to those $10 tactical lights they sell everywhere and those cells make the light brighter than the original AAAs and last forever. Only problem is you need to keep an eye on the voltage of the lithium cell and recharge it before it totally dies.
