Interesting. I found myself only ever charging two batteries at a time so I bought the Nitecore D2. It charges just about anything (Li-Ion IMR Lifepo4 Ni-MH Ni-Cd 26650, 22650, 18650, 18490, 18350, 14500, 16340, AA, AAA, C).

BTW, the 1500 lumen Solarforce K3 with two 18650 batteries ended up in the truck after I picked up the M3 (also with two 18650 batteries). So I bought a second Nitecore D2 for the truck. Face it, if you normally do all your battery charging at home, but unexpectedly need to recharge batteries away from home, it's cheaper to buy a second charger than another set of Li-Ion 18650 batteries. So if I can stretch the imagination a bit and call my truck kit "EDC", I EDC a Nitecore D2. Okay, not EDC, but once you go to rechargeable batteries, having a charger is sorta critical.