you could have a bad alternator. the battery cant handle all that voltage alone. you might want to go to autozone or somewhere like that and have it tested.
'99 wrangler TJ 4" RC lift, 33x12.50 BFG KM2's, Banks Monster Catback, Warn M8000
'07 JK 4-door Rescue Green 3" RC lift, 33x11.50 Nitto terra grappler (dad's)