Hi-- This is actually a problem with the Canon LK-51B battery pack that goes with the iP90v portable printer. We've charged up the battery pack and all the lights have gone out, indicating full charge. When we connect it to the printer and turn the printer on, the lights on the battery pack do not come on, as they should. And the printer turns off again in a few seconds-like there is no power. When we plug the AC adapter into the printer thru the battery pack, all works fine--battery lights come on as normal and the printer works. I checked out the tiny 5 pin connecter interface between the printer & the battery pack, and it looks good-I even dusted it out with a brush. The lights on the battery pack don't even blink when you turn on the printer, as the manual says it will do, as it "reads" the battery's charge. If we turn on the printer without the AC adapter plugged in, it goes dead in the water. Both units are brand new. Help!