Camera Battery Phone Charger

by walter, published

Camera Battery Phone Charger by walter Apr 10, 2017
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USB charger for Pentax D-Li90 batteries. I've been using previous versions of these to recharge my phone (which I use as a GPS) on backpacking trips, but the older versions aren't working as reliably with newer phones. This circuit seems to work better and is much smaller. I usually top off my phone with the batteries when they don't have enough charge for my camera, but I haven't checked to see how well that works with this converter.

Uses a step down circuit with USB Port*. A USB power meter* can be helpful for testing.

Ruby Red and Sapphire Blue Translucent PETG from Atomic Filament

*affiliate link

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I toyed around with this idea one day when I was stuck with two full camera batteries and a dead phone (I wonder how much inventioning I'd do if I didn't have sudoku-on-demand?), but quickly dismissed it due to the fear of under-volting the lithium-ion camera battery. Is there any protection against this either in your circuit or the battery?

Edit - It appears as though Olympus has under voltage protection in their batteries, and I emailed Blue Nook to see if their Wasabi Power line batteries do and their service rep confirmed with their factory that there is over and under voltage protection built into their batteries.

BTW - slick design: I'm going to remix this to use for my battery, though I think I'll have to employ a rubber band or something to keep the contacts in place on my design.

These batteries have a protection circuit built in.

I thought they should have under/over voltage protection built inl. Having seen thermal run away happen before my very eyes (intentionally and in a controlled environment), I'm a bit nervous about lithium ion cells.

Walter, always love the creativity behind your designs! I follow you on every 3D design site I'm on. Thanks for this awesome idea!