Since this hasn't been said yet, you really can't leave your battery connected while in storage (unless you have shore power available and keep the trailer plugged-in). The battery disconnect doesn't remove all loads from the battery, but even if you disconnect the cables from the batteries, they will self-discharge over time.
The best thing to do for them is to bring them home and keep them on a good battery maintainer, like the Battery Tender.
Also, it sounds like you towed your trailer with a dead battery - this is not a good idea (and I'm pretty sure, not legal). The main reason for the battery while towing is to provide emergency power to the trailer brakes should the trailer become disconnected from the tow vehicle. If the battery is dead, there will be no brakes.
Finally, batteries don't like to be discharged all the way. I understand you're going to be getting new batteries. You will want to make sure you never let them discharge below about 50%.
__________________
2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
|