I recently bought a JB3 and I am having a problem with it. I plug it in to charge it, leave it plugged in overnight, and morning comes and it has no battery power. It only runs when it is plugged in, the battery (I only have 1 right now) doesn't seem to hold the juice. Any suggestions as to how I could go about fixing this? Are two brand new batteries in order or is this probably a problem with the JB3 itself?