My Rockwood 2516G (2007) wont crank manually. Batteries are dead, power hasn't juiced them up yet so we tried to use both the crank then the socket. Gave up after a minute or so because we saw NO signs of movement. Does it just take a really long time to get going? Or is it broken? It's always popped up fine when plugged in. It was taken down yesterday at the shop with a drill bc the battery was so dead.