Originally Posted by homeless
Batteries seem to have caps that are not designed to get off easily? Do I pry them off with a screw driver?????
There are three kinds of lead/acid batteries:
Common batteries that should be taken care of,
Common batteries that have been made maintenance resistant,
Special batteries that be maintenance proof because none should be required.
Common batteries have caps and the electrolyte level should be maintained.
Common batteries with maintenance resistant caps will still benefit from having the electrolyte level maintained, but the manufacturer both believes that the owner is not smart enough to pour water into a hole, and expects you to buy a new battery very soon. So, if you are smart enough to pry off the caps and add the required water, you can probably extend the life of the battery several years. If the cap breaks (many do), just look at the holes carefully and then go to either a scrap yard or a recycling center and claim some replacement removable caps.
Special batteries are GelCel or AGM and neither has liquid electrolyte to refill, but these are not real common in RVs.