Posted on 29/01/2017 21:13
Hi all, started m/h today after 4 weeks and after running the engine for 30 mins leisure battery was showing 85% on the control panel but as soon as I switched the engine off the level dropped to zero in a couple of minutes with no draw showing on the control panel. Battery is 3 1/2 years old and normally reaches full charge in minutes. Any help welcome
Posted on 29/01/2017 22:10
Assuming you have the 'battery by your home, then
the best I can suggest, NTD, is to remove it and
get a smart charger ( if available ), connect it &
leave for a good few hours. Then check again --
if there is no significant improvement, ( I'm not asking
nor expecting perfection !! ) then it's more than
likely you are the proud owner of one deceased
lump of lead in acid !! Sorry for the news 
Brian
P.S. And I did NOT say Bread in Aspic !!
Posted on 30/01/2017 09:31
A battery can not be charged in a few minutes.
The voltage reading after a short charge (30 mins) will decay slowly over a few hours and end up the same as it's pre charged voltage....in your case did it really charge the battery at all?
After charging use a multimeter at least 12 hours after charging to get the real state of the battery.
HTH
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nelliethedog