FNM HPE Series Owner's Manual page 82

Acid liquids contained, use appropriate protections!
2. The electrolyte level should cover the plates.
3. If the level is insufficient, fill up to Max level with distilled water.
4. Replace the caps after the charging cycle.
Battery state of charge could influence the engine performance. Avoid discharging excessively
the batteries.
Grease the battery poles with basic grease periodically. The battery electrolyte status can be
measured with a manual densimeter.
78
Figure 32 - Traditional lead-acid batteries
®
FNM HPE Series