https://docs.google.com/document/d/1OvIKIJfTjpMXZMdTShj7K7j00zzRHgZEYo4A3_gFvso/edit?usp=sharing Reliable battery vendors.

Do not, do not, DO NOT buy batteries on Amazon. Flashlight batteries do not have the CDR required and I can't find any reputable brands.

https://www.amazon.com/18650-Universal-Automatic-Rechargeable-Protection/dp/B07H32WVTF/ref=sr_1_3?crid=1F1ZQ75XRH05K&dchild=1&keywords=miboxer+battery+charger&qid=1611935799&sprefix=miboxer%2Caps%2C190&sr=8-3 This link is for the Miboxer C4 battery charger. There are other vendors selling the same thing. I have this charger and it works great.

That is a shame. Those were great chargers.

Have discharge / refresh function

The refresh function isn't very common. All it does is discharge and charge a bunch of times. Maybe 30 times?

Good to have: able to charge AA lithium rechargeable battery

If you mean 14500 (4.2V) cells then there are plenty of those. If you mean 1.5V proprietary cells then there is nothing for those.

Some nice options I see are the Opus BT-C2400 and the Miboxer C4. The C4 can also do larger batteries and li-ions.