Originally Posted by Senior Chief
Unless you have an AGM or gel battery, you should ALWAYS check the electrolyte levels of a don't-know-why-its-dead battery before charging it.
The water should be at least 1/4" above the top of the plates.
Close, Close, Instead of "AGM or Gel" you should have said "Maintenance Free" of which both AGM and Gel are sub-sets.
Folks forget that there is a difference.
For RV use the only significant difference is that non-AGM/Gel must be mounted "This side up".. Oh, and they cost a bunch less.