bigclive
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USB LIR2032 button cell charger
🕑 Added 2024-01-10 06:15:40 +0000 UTCA very minimalist USB powered charger for the rechargeable version of the 2032 lithium button cells.
The circuitry is as expected, except for one mysterious resistor. I wonder if it's for stability due to the unusually low charging current.
Comments
Gordo
Anecdotally, I bought some of these off Ali a while back to test in the kithen and bathroom scales. Unbranded single-use 2032 cells last 6-12 months, rechargeables last 1-2 months. But I suppose Ali.. yeah..
Big Clive
Sadly they have a much lower capacity than the non rechargeable ones.
John Riney
I'd no idea there was a rechargeable version of those. Very neat!
Torbjörn Lindgren
No, some fancy charger doesn't provide power at ALL until they see something on the other end. And yes, this breaks some older/crappier devices that didn't bother following the USB spec - technically the fault is not with charger.
Jack Hodgson
Re the lack of a "programming" resister on the USB C plug, you said, "This won't work with fancy power supplies...". Is that right? Won't it work with fancy supplies, just only receiving 5v. ??
