1. Support external connections in series with voltage up to 51.2V.

2. Support external connections in parallel.

3. Lightweight design with wonderful looking and durable.

4.  Fast charge performance.

5. High durability, easy to carry, the cycle life over 3500 times.

6. Over voltage, low voltage, over current, over temperature, low temperature and short circuit protection.

7. Independent protection for charge and discharge