@contactcr, no problem. Just upped the discharging current to 700mA. 1A could be possible, but you’d have to limit discharging current to 1A/2 bays to help with heat dissapation.
Also, putting a small aluminium heatsink on these resistors would help a lot.
@hank, that is easy peasy. Just set the charging voltage to 3,9V, and be off with it. Charge it normally up to 4,2V once you need it.
I love the idea of a perfect charger. I have to use a Folomov A1 to charge my Wuben 21700 that is 75.1mm. Could this project somehow ensure that the longest 21700s fit?
That is possible, but is slightly harder and more error prone.
Chemistry is just based on the internal resistance analysis, but it has to be conservative. Currently, the C4-12 that I have likes to go at 3A on my 30Q during automatic charging, while I would prefer 1,5A at max.
Length would be slightly harder, but would require additional hardware.
I would refer the option to custom selecting cell chemistry, type, size, and amps-charge rate when required, ( but have a auto 18650 LiIon & AA NiMH as standard automatic with a default charge rate, ( but also customizable. Also woudl be good to have one of the charge Bays adaptable with an output port, (the charger would be great with at least four bays) that output port would have leads for charging wired cells like square LiIon and other packs, large cells like 32650s, (i have 7 of them) and even have the lead-adapter with tiny magnetic positive & negative connectors so they can snap to everything in cell size from a 10180. I know cost may be an issue for that, but a true “universal” charger needs to be able to charge every type of cell at every amp range selected, and connect to them easily. One great single cell charger i really like that can charge nearly every size cell is the Olight mini USB magnetic charger, (I have 5 of them) ( that senses the polarity and charges them, But the only issue its set at one charge rate only.
What an awesome idea. Yes, yes, yes, we need BLF ultimate charger
What about BT App? Since SKYRC is on the mouth, they are also (hmm…) experienced in incorporating BT module and Application. But I must say the one going with MC3000 is kind of primitive (sorry SKYRC). The good one could shake the market if the price is “friendly”.
I’m all in. All my chargers are at most mediocre. I’d like to buy a high end one but there’s nothing that really suits my taste.
A few comments:
100 mA minimum current is quite high for 10180, 50 mA would be better.
making the 2 outer slots larger (deeper, with a larger slot cutout diameter but without larger width) would enable 32650 support
4.35 V cells are rare nowadays but I don’t think it would hurt to enable the top voltage this high
this could possibly be also used to overcharge regular cells to 4.2xV for that tiny output boost…with x depending on the precision of voltage measuments
I see no mention of capcity measurements. I suspect this is an omision.
discharge current should have high adjustment range, ideally the min would be 100 mA or so for 10180 and max 10A+ to test powerful cells
adjustable discharge terminal voltage would be useful as well, some would like 3V, some 2.5V, some probably different numbers as well
If it has active cooling, how about putting one of those PWM controlled 120mm slimline fans in the bottom of the charger? It would be quiet and effective, sucking in air at the bottom and pushing it out at the sides/top of the charger.