Ideally, the battery will have been maintained throughout the hibernation period. However, if it has been allowed to go flat, there remains the risk that it may not recover properly.
Like any vehicle, your motorhome should have been turned over for 15 minutes or so every now and then. So you shouldn’t have to worry about having a flat battery when waking up your vehicle.
Talking about your caravan battery, YouTuber Dan Trudgian says, “Clean the contacts on the battery and ensure there is no corrosion on the terminals. Check the battery is of good charge, so 12.7v or higher, less than that the battery will need charging up. Then test the caravan by checking lights and the caravan panel.”