funkawa (2- Pack) Shockli 16650 1800mAh Rechargeable 3.7V Batteries[ Replacement for 2 x CR123 ] - Protected Battery

They work and hold charges well

Nice little setup. You get 2 batteries so you can rotate them and always have power. These will pay for them selves after about 3 recharges. hard to beat. I would definitely buy again.

Has worked well in my night vision rifle scope, and now can avoid buying batteries every few months.

Love the fact that I am no longer throwing away worn out batteries from my flashlights any more. Now I just charge it up and use it without any worries. Then after usage, if over an hour of light I just throw it back on the charger and I am ready for another night.

Works as it should in my Rayovac flashlight!

I've had trouble with these since I bought them. They work one day, then not the next. Honestly, I'm not sure if it's the batteries or the charger? I may order a different charger to find out, since the batteries seem like decent quality?

I ran a capacity test on two-pack of these using a XTAR VC4 Plus: One tested 1580mAh, the other 1671mAh. 1671 is right in line with what you'd expect. 1580 is a bit short, but not egregiously so. The size is nice, and you can use these to replace cr123 batteries even in tight fits. I bought them for flashlights. On my old fenix pd30 it fits perfectly, and on my old iNova it was a tight fit, but it would still slide out. (the 1580mAh one slid in an out more easily, so I think it's a touch smaller.) Overall, I'm happy with my purchase, and I'd recommend these for anything where a 18650 is just a bit too large.

Had it for a while no and it hasn’t blown up yet so I’d say it works.