So building a small board just like the TP4056 you can get a 1A charging rate [thermally controlled] (or just buy a bucket load of those cheap Chinese TP4056 boards.
Uhhhh… no. Max charge current is 1A Also no mention of reverse battery protection. Specs given in the listing appear to be random garbage pulled out of recycle bin.
no no no…the charge INTO the battery is 1A max [per the spec sheet of the TP4056] (I plan on putting a 2.2K resistor limiting to 500mA~) the MAX out of the battery protection from the link I put on there is “supposedly” 2.5A [but we all know how those Chinese specs and components work out])
Julian Ilett did a review on youtube a while back
Either way…I didn’t know you could order the TP4056 chip by itself
And since I didn’t know I went looking for a “replacement/equivalent”
Hmmm… the ones that I have with the battery switch circuit have a different layout. Looks quite a bit different. And costs more. I wonder what the parasitic drain on the battery is? I sent the boards that I havd on their merry way and did not measure that.
I need to crawl through datasheets for a bunch of Li-ion charge controller chips. It would be nice if I could find some with adjustable charge termination voltages.
Being new to this, but interested: do these boards do the the full job of charging batteries, like following the correct charging algorithm and such? And are these the ones that are build in those wall chargers that come with crappy flashlights with charging ports?
In terms of the wall chargers that come with crappy flashlights… I would not assume that’s what they’ve got. Those could contain nearly anything: cheap CV PSUs set to whatever voltage seems best, at least one report of a regular 5v PSU (!), or some (even less expensive than TP4056) glop-top charge controller.
Thanks for the heads up on the MCP73833/4, that looks like an interesting one. Availability doesn’t seem so hot on the 4.35v flavor we’d be interested in here. It seems that Digikey does not have them, Aliexpress does not have them, eBay does not have them - but Mouser does.
There are only two 4.35v parts, both DFN-10:
MCP73833-NVI/MF
MCP73834-NVI/MF
MCP73833 has the Power Good option. and - I think I’4 has the Timer Enable (and disable) option. I’m not really sure what PG is for. It’s worth pointing out that a 1A charger is going to be unable to charge higher capacity 26650’s in one try (EDIT: with a 6hr timer I mean). OTOH I think I’d rather just use a “big” charger for those cells and maintain my safety timer ;-). Both of the mentioned part numbers come with a factory set, non-adjustable 6hr timer. The 4 model has TE so it can turn it off, but you can’t adjust it.
