@ BlueswordM What is the reason not to be able to recover NIMH? Quite a few of my AAA’s are down to 0 when I recharge them. Even eneloops that have been charged once. They seem to work 100% after the recharge.
Would be a very nice addition IMHO!
For the 9V’s in my sons RC car remote I can live with These
I’ve been using NiMH AA and AAA batteries for decades, but I’ve never discharged any to 0V, so that’s pretty impressive 
. Perhaps…
1. Features on this charger are frozen, or at least gelled .
2. Recovery is actually somewhat difficult as it’s the battery chemistry is not obvious when the voltage is out of the normal range. Triggering a recovery mode manually would be desirable, but adds complexity to the user interface (I would like this option, as it avoids auto-detection and requires special knowledge).
I’ve occasionally had to recover NiMH cells, but it’s usually as simple as shorting the positive and negative terminals with a cell inserted. That tends to jump-start the charging process on my old LaCrosse charger BC-700, anyway.
Because that’s a good idea for NiCd cells, but not NiMH cells.
One way to remedy this would be to just let the cell in the charger until it accepts current, like how my Miboxer C4-12 does with old NiMH cells.
I would rather fix the devices that do this rather than counting on the charger to do so.
TLDR: Simpler can be better.
Put me in for 1
I recently found a very old NiMh (non-LSD type) battery in the drawer. It (very likely) has not been touched for at least 10 years. I recall using that battery when I had an old digicam (maybe around 2003 give or take a few years) that uses 4xAA batteries. So I use that type of non-LSD AA NiMh for that digicam. (Eneloops were not yet available when I used that digicam, although I recall the LSD “Harmolattice” NiMh started showing up a few years after that).
When I found that AA NiMh battery, it measured 0.0x voltage on my DMM (less than 0.1v), tried it on a few different chargers but they didn’t start charging the said NiMh.
So I tried doing a parallel connection from a good AA NiMh + side to + side of this 0-volt NiMh; - to - side to jump-start the “dead” NiMh battery, for several seconds. This was able to increase the voltage of the “dead” battery (I forgot what voltage, but I think it was now higher than 0.5v).
Placing it in my charger, I did a refresh test (charge/discharge at ~0.2 or 0.3A discharge current), and I got ~1100+ mAh discharged capacity (the AA NiMh was labeled GP 1800mAh NiMh). Tried using it in AA flashlights still work (Turbo mode is not that bright, indicating it has a bit higher resistance), but Low, Medium and some High modes will work. So far, it’s a month later, the battery still works. So apparently some dead AA non-LSD NiMh batteries can be recovered…
Interested!
Please add another one for a total of 2. I am number 201 on the list.
Thanks
Interested. Great project!
Very interesting! Please add me for two.
Please add me to the list as well.
A resounding a giant thanks to BlueSwordM for all the great work on this project as well as all the other folks that have contributed ideas, suggestions, and constructive feedback.
Best Regards,
Tim
I’m in for this! Thumbs Up
Interested
Interested. Great project!
I am in for 1
If you do another discharge test you will probably notice the battery is in better condition now. In my experience old, unused Ni-MH cells get numb and may need a 2 - 3 cycle reawakening.
By the way, what's up with cell recovery? If I am to buy this charger in the future, better for it to have a full blast expert mode without nanny limitations. I need no one to tell me what I should do or not in these matters, much less a 
moronic 
device.
I am interested in one.
Thanks BlueSwordM for making this happen!
Please add me to the interest list, thanks!
Small feature update and idea:
Would you guys like a feature in which the two left slots are able to super fast charge 18650/21700 cells at 4A per slot?
Of course, total current would still be 12A, so the two inner slots would be limited to 2A operation if both fast charging slots were occupied.
Would be limited to 4A would to 4,0V, and 3,5A up to 4,1V, but would still be amazing to have in a bunch, knowing that the internal resistance of a cell is lowest between 20 and 80%(3,4-4,0V), so that would actually be a nice benefit in emergencies.
Also, because of that, a UI update will be coming soonTM, with a much nicer graph, and a nice display besides it.
I though 4A was not good for cells. It may be OK in a pinch but I don’t think I would ever use it.
Not a feature I would ever use