4应保证电池满荷状态,以延长其使用寿命 Charge the batteries for the time shown by the specification if the batteries are not charged sufficiently their life may be shortened The batteries should be fully charged to longer the working4.应保证电池满荷状态，以延长其使用寿命。 Charge the batteries for the time shown by the specification, if the batteries are not charged sufficiently, their life may be shortened. ↓ The batteries should be fully charged to longer the working life