This Uniross USB Battery Charger is ideal for both versions of the Uniross Rechargeabe 18650 battery. This compact-sized battery charger is simply plugged into any USB socket, and an LED light indicates the charging status of the battery. This Uniross USB Charger will charge the Uniross 2400mAh 18650 batteries in around 5 hours. Please note this charger will only charge one battery at a time. It also protects your batteries against short-circuits and reverse polarity.