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
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..
Gordo
2024-01-14 22:46:56 +0000 UTCSadly they have a much lower capacity than the non rechargeable ones.
Big Clive
2024-01-11 01:14:11 +0000 UTCI'd no idea there was a rechargeable version of those. Very neat!
John Riney
2024-01-10 20:19:56 +0000 UTCNo, 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.
Torbjörn Lindgren
2024-01-10 19:31:50 +0000 UTCRe 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. ??
Jack Hodgson
2024-01-10 16:07:49 +0000 UTC
