TOMO V8-4 Intelligent 18650 Portable Power Bank & Battery Charger 2 in 1 with Double Output and LCD display (Black)

I use recovered batteries from old laptop battery packs, separate them out and charge them. I can then use them in various other things and create my own packs. It also works as a battery pack to charge my phone when I'm out and about.

It works to charge my 18650s and has come in handy as a portable cellphone charger on multiple occasions.