Since most stores have a one month return policy and a three month replacement policy (double check what the exact policy of the store you bought her at is), it's best to run the Pleo as much as possible in the first month that you have it so any problems that would occur early on into ownership will occur then. I would run through a few more battery cycles to see whether the problem disappears or progresses into something worse. If it goes away, you should be fine and if it worsens, you'll have good grounds to return her on. I believe "factory problem" covers anything that wasn't caused by you, and something that occurs with normal use is not your fault, so that is the argument to make there. I've never had any issues with returning any of my faulty RBs, though for one I did need an e-mail from Innvo agreeing with me that there was something wrong with the Pleo and that the distributor would handle it better than they could.