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Picked up a Goal Zero flashlight from Woot last week, and was upset to find that (contrary to the advertisement) it won't charge normal 18650 cells.
The battery it came with was unusual, in that it had two contacts on the top of the cell which corresponded with two contacts inside the flashlight:
These charging pins, when powered using the USB port, put out a positive and a negative value which combined make ~4.2v. (Note: I switched the alligator clips accidentally ...
Seems like that secondary contact ring on the battery is just routed to the negative contact of the battery, which prevents the flashlight from charging any battery other ...
I removed the covering from the outer charging pin and attached the connector to the spring inside using the poor man's solder. (I wanted to stick with non-permanent ...
I reassembled the charging pill
And put it back in its housing
That's pretty much it, really. The flashlight goes back together as you'd expect, except there's a thin connector that sticks out the bottom and gets sandwiched between the ...
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