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Ive seen a thread on batteries around here...some place ..
It can be a very detailed subject.
If you have or can borrow a volt and a milli amp meter to see if you may have a draw in the circut, Dry or very low fluid in a battery may not be a issue ..but it will take a very slow charge 2 amp or less to bring it back .
Do you have a charger on the batteries on the 110 volt side and have you checked to see if it is putting out ..13 volts give or take ....
If you have a volt meter not a amp meter is sometimes better ..you can kill the switch and see if thermight be a power draw . Trying to keep it simple for you .a meter out side the line is better to use .
See if some one around you has a battery tester . borrow ,rent .
disconect them and it will tell you the condition..most tester s will tell you if the charging system is working properly weather it be a outside source ,charger or the alternater.
If it has a 'trickle" charger is it working ?
Think of your electrical circuits like water pipes ..the electrons run in them instead ...they go in and in DC ..mostly 12 volts the electrons ( water ) has to come back to source aka ...battery .
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