FNM HPE Series Owner's Manual page 80

Repeat the operation if necessary.
3.3.6 Battery status check
Ordinary maintenance: made by the boat user and the workshop staff.
Be careful when operating near the battery compartment. Disconnect the battery cables
before working on it.
Do not smoke near the battery. Flammable gases could be left by the battery.
3.3.6.1 Batteries that are maintenance-free
This type of battery is equipped with an indicator of the battery charge status (1). Depending on the
color of the indicator you can see the level of battery charge:
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FNM HPE Series