Yes the battery looks to be the initial indicator. A weak battery will not allow the slides or landing gear to properly function. I too had a battery to slider/LG problem. Repair techs found the umbilical cord faulty (battery charge was very low) and replaced it. Two years later, still no problem. Try charging the battery and see if they will operate.
Don & Dona W/yorkies Gizmo, Master Chief, & Tali
2011 Flagstaff 8528 BHSS 2015 Ford 6.7 XLT
2010 Full Timers & Still Going