leisure batteries discharging

[johnv]

just about to go off on hols and it appears that the leisure batteries are discharging far too quickly, from 100% to 70% overnight when nothing is turned on - no lights left on, fridge off etc - previously the van would still show 50% after 3 days with the fridge running at level 5
- van is 2012 model, roof switch just replaced under warranty, any ideas ? thanks

 

[CaliforniaDAN]

In my experience the percentage shown on the display is inaccurate. I moved my van 10 feet so I could load up to go for a trip to Coniston and it showed 80% when I switched the ignition on and then 100% when I switched off. My best practice is to keep an eye on the voltage reading and if it gets to 12.0 volts I then either go for a good run or put the leisure batteries on charge for 12 hours.