3在25℃C下,保证每六个月至少充电一次 Charge the batteries, at least once, every six months during storage below25℃ Batteries should be charged at least every six month below 25C3. 在25 ℃下，保证每六个月至少充电一次。 Charge the batteries, at least once, every six months during storage below 25 ℃. ↓ Batteries should be charged at least every six month below 25 ℃