Hi- considering purchasing a pocket pod on eBay from a very reliable seller. Problem is he says it does not work using batteries He is including the AC adaptor but I would like to use battery power as well. The curious thing is he has multiple units for sale and none work on battery. Says he thinks maybe he is missing something and they are probably fine. Anyone know a reason why they all would not work on battery? Is there some setting on a pocket pod which could cause this? Thanks.