The Golisi S2 Smart Battery Charger has a bright blue Liquid Crystalline display to tell you what is going on while your batteries charge. On this screen, you can easily see the percentage charged, voltage, current and the time until charging is complete. The S2 charges most rechargeable batteries from 32mm to 70mm in length and 32mm in diameter. It is able to determine what type of battery has been placed in its docks and charge it according to that particular battery’s needs. The 2A slot offers lighting fast charging for when you need a battery charged in a hurry. Smart polarity prevention works well with the S2 charger. The body of the Golisi S2 is made with fireproof ABS+PC material and the springs and contact plates are military grade stainless steel and should last 100k cycles. With the S2 you can even charge different batteries sizes and chemistries at the same time! AND with its built-in USB port, when your batteries are charged, you can hook the S2 charger up to your portable device and use the S2 as a Power Bank!!!