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Leisure battery
Posted: 7 January 2022 4:07 PM
Subject: Leisure battery
Gets involved

Posts: 266

We had two new leisure batteries fitted about 18 months ago. The motorhome hasn't been getting much use since October though we have checked the 12 volt was switching on. Yesterday we were going out and the 12 volt was dead. Is it safe to charge it by plugging in to the mains?
Thanks in advance.
userDerek Uzzell
Posted: 7 January 2022 4:53 PM
Subject: RE: Leisure battery

I believe your motorhome is a 2005 Hymer Camp C524.

Allowing a vehicle battery to become completely discharged may cause irreparable damage to it. And even if the battery is not damaged, a battery-charger may not be able to immediately start to revive it.

There's a good deal of online advice about charging 'dead' motorhome batteries

but it's not easy to advise on the likelihood of successfully recharging yours without knowing the voltage they have now sunk to.

If you aren't in a position to provide voltage readings, all you can really do is connect your motorhome to a 230V hook-up and see if the motorhome's onboard charger will revive the leisure batteries. If the batteries begin to charge, leave them on charge for at least 24 hours.

(If your motorhome will start, running its motor should begin to put charge back into the leisure-batteries. But you'd be better putting the motorhome on 230V hook-up for a day to fully charge the leisure-batteries.)
Posted: 7 January 2022 5:12 PM
Subject: RE: Leisure battery
Gets involved

Posts: 266

Thank you, Derek, once we discovered the leisure batteries were discharged we were able to start the van and drove for a couple of hours, but still not a hint of charge on the 12 volt. The batteries are Varta Professional 90Ah 12volt.
Posted: 7 January 2022 6:27 PM
Subject: RE: Leisure battery

Lord of the posts

Posts: 6040
Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.

Are the batteries actually discharged or has a fuse blown?

Do you have a voltmeter to measure the actual voltage directly at the battery terminals?

Posted: 7 January 2022 7:19 PM
Subject: RE: Leisure battery
Treasured contributor

Posts: 888
Location: Burstner Ixeo 736

Sometimes if a battery is dead flat it can cause the fuse to blow. If you have a check charger try using that. Put a little charge in then rig a low wattage bulb to run it down a bit then charge again working the battery this way can sometimes recover it.
Posted: 9 January 2022 7:49 AM
Subject: RE: Leisure battery

Forum master

Posts: 2212
Location: Horsham, SX.(10 Rapido 7090F)

Sometimes it’s worth the time and pain of fitting a couple of 12v indicators to the batteries just to show a quick indication of charge.

EBay have a range at moderate cost and Ctech have connectors that have LEDs built in.

A quick glance tells all and maybe time to give a quick booster charge.

I often wonder if it’s worth fitting an isolation switch to the leisure battery and charging it . There might be less drain on the battery whilst standing.

Vehicle battery is a different due to discharge to supply the ecu , burglar alarm , entry locks etc.

Posted: 11 January 2022 2:30 PM
Subject: RE: Leisure battery
Gets involved

Posts: 266

Thank you everyone, with all your help and tips we managed to get it back up to 13.4, after two days still at 13.2 so we are hopeful.
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