FNM HPE 300 Owner's Manual page 53

Marine Diesel Engines
To check the electrolyte level refer to the level mark is on the battery side.
To refill
1) Remove the caps on the upper part (see figure).
Acid liquids contained, use appropriate protections!
1) The electrolyte level should cover the plates.
2) Refill if is necessary to MAX level mark with distilled water.
3) Replace the caps after the charging cycle.
ATTENTION ! Avoid discharging excessively the batteries.
ATTENTION ! Battery state of charge could influence the engine performance.
>Grease the battery poles with basic grease periodically.
>The battery electrolyte status can be measured with a manual densimeter.
ENG rel. 1/11
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WNER S ANUAL
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Engine maintenance
HPE300
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