The Golisi Needle 2 Compact Mini Battery Charger is an ultra-compact portable two-battery charger. It charges any cylindrically shaped battery from 32mm to 70mm. Recharging has never been easier. When charging the indicator light will be red and once it’s fully charged the light changes to green. It will then remain on standby and stop charging entirely, giving your batteries a longer life period. In case you accidentally place your batteries in backward, the built-in temperature control will prevent problems from happening. The body of the Golisi Needle 2 is made with fireproof material and the springs are military grade stainless steel. Keep your batteries charged safely with the Golisi’s Needle 2 Battery Charger!