There is no need to manually charge the batteries. They are charged automatically either via the engine or shore power charger. The system includes an overload sensor.
- 
                    
Make sure that the battery compartment is always well ventiĀlated when charging batteries.
 - 
                    
If you cannot use the engine or shore power chargers, remove the batteries from the boat for charging with an external charger.
Never use an external charger on the boat!