The comments about NiCd and NiMh batteries are misleading. However, they are also irrelevant as this lantern is powered by an RT640 6V 4AH sealed lead-acid battery. It will be permanently damaged if allowed to run down completely.
This battery should be charged using a constant voltage charger. Details on the one I've inspected specify 7.3 to 7.4 volts for normal charging, and 6.85 to 6.95 volts when on standby (at 25 degrees C). The battery will be fully charged when its terminal voltage no longer rises. I don't know whether the charger supplied with this lantern meets these specifications as I don't have one.
Keith Wicks
Probably between 3 to 5 hours.
Check battery regularly. It should be warm while charging. When it begins to get hot it is charged. If you charge the battery for longer, there is the increased danger of fire or leakage from the battery.
Note how long the battery has been charged for and during for future charges, reduce the charging time.
NiCad batteries should be run flat before being recharged rather than being topped up in order to get maximum life out of the batteries. This is less critical with NiMh batteries.
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