Doohan DH-18 2019, User Manual

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电池充电环境

Please charge the battery within the ambient temperature of O ℃ ~ 35 ℃.

the charging time shall not exceed 10 hours, and overcharge will shorten
the service life of the battery.

It is forbidden to cover other items on the charger and battery box for
ventilation and heat dissipation during charging.

Do not dismantle the charger by yourself. If you need to replace it, please
go to our special maintenance department to replace it.
Attention:
It is forbidden to charge the battery box when it is inverted, otherwise the
battery life will be seriously affected.