Honda EG3600CX Owner's Manual page 21

The battery fluid level must be kept between the UPPER and LOWER
level marks. If the battery fluid level is below the LOWER level,
sulfation and battery plate damage will occur.
If rapid loss of battery fluid is experienced, or if your battery seems to
be weak causing slow operation of the starter motor, see your
authorized Honda generator dealer.
1. Locate the battery. Check the battery fluid level with the generator
on a level surface. Remove the battery cell caps.
2. Inspect the battery fluid level of each cell.
The battery fluid level must be kept between the UPPER and LOWER
level marks, and battery fluid should cover all the plates.
3. If any plates are not covered, remove the battery and add distilled
water as necessary.
For battery installation, refer to the Battery Tray Kit (see page
BATTERY BATTERY CELL CAPS
56
UPPER LEVEL
LOWER LEVEL
).
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