Heavy watering is only required for a heavily used , discharged then charged battset or for an over voltage charger that should be replaced.
For most cruising Hydrocaps are a simple solution IF there is room for the devices.
Hydrocap | Information
More Information. image. Do you need Hydrocaps
are a must for lead-acid battery users. Just look at the increased safety, reduced maintenance, ...
Things that Work! Home Power tests the Hydrocaps
One of the perpetual chores in home power systems is watering the batteries. These large lead-acid cells ...