Description Features: 1) Newer: a) Adopts large Ni-MH capacity battery as charged power b) Completely free maintenance without any acid and alkali pollution 2) Smaller: a) Small volume, lightweight b) Total weight: approx. 820g c) Relieves the users' labor load greatly 3) More convenient: a) No need to add acid, electrolyse during using b) Unnecessary of any form of maintenance even if it is free for a long time c) Can automatically test the charging device d) No need special attending on it in charging process, won't overcharged 4) Safer: a) With short circuit protection device b) When short circuit in circuit, the protection device would cut circuit immediately, and it performs circuit protection function c) After the fault remove, the short-circuit device auto resume to normal working state