ciciglowPower Bank Kit,10 x 18650 Portable Dual USB Power Bank Shell DIY Kit Normal Battery Box No Welding Mobile Power Case Kit(black)

Excellent idea let down by 2.1A output only. Mini usb and Type-C are only for input l, so they don't provide output.Box seems good quality and easy to pop in your 18650 batteries in it. Would've given it 5+ stars if it had 3A charging option.

I bought 2 of these and both were used often, recharged twice a week. One power bank lasted 6 months and then the charging socket failed but the other power bank is still going strong. I would say this is a good choice but be careful with the charging socket