You can use this to charge your 18650 batteries
POWERED BY USB, USE IT ON THE GO
more info here http://charger.nitecore.com/product/um20
Li-ion / IMR 18650,18490,18350,17670 17500,16340,14500,10440
Micro USB DC 5V
4.2V ± 1% / 5V 1000mA / 500mA