Repurposing protection boards from LiIon cells

Fallingwater

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Jul 11, 2005
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Since there are many lights that don't have built-in low-voltage protection, and adding protection to a driver is beyond the capabilities of most quick-and-dirty modders, has anyone ever stripped the protection board off a protected cell and fitted it to the driver of an unprotected light? That would give permanent protection for all cells...
 

mpteach

Enlightened
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May 24, 2005
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I was wondering he same thing. Your charger would need protection as well as the light.

I would think the tailcap would be a good ace to put the protection pcbs.
 

Fallingwater

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Trieste, Italy
Yep, but then you'd need to somehow get a positive wire to the tailcap. At first I thought about a thin strip of aluminium foil insulated with tape, but you can't solder to aluminium...

This is a non-issue if the light is meant for larger cells (say, a 3AAA that you're repurposing to run on a LiIon), as you can just use a wire, but on others it's a problem.

If you can break the negative connection between the driver and the body of the light, you could then put the protection board on the positive side. Positive terminal connects directly, you get the negative from the body, and then wire up the driver straight to the protection board. But you can't always break the connection...
 
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