Sounds like you have a bad battery. Take the battery out, fully charge it using a regular automotive charger and then have it load tested. As for the slides? Hydraulic or electric? Can make a difference. But I would first suspect that due to high amperage draw you simply tripped a breaker someplace. Start looking for the bank of resettable breakers. They will be very close to the batteries. Feel around them for a very small button. If one is out, push it in and that should restore power. If your not sure, get out the VOM and start tracing voltage.