I picked up a grey Robosapian model V2 for $25 on craigslist a little over a year ago. It has been working fine since then and entertains my 3 year old quite a bit. The other day it said "brain battery low, powering down". OK I thought, time for some new batteries. I replaced all D and AAA including the transmitter with new Duracell batteries. Turned it back on and he worked for about a minute then gave me the same error message and shut down again. OK another set of all new batteries and I cleaned the battery contacts with electrical contact cleaner. Turned him back on and after a minute the same thing happened. He has not been dropped (my 3 year old won't touch it, just likes to watch it from a distance) and all other features work perfectly for the 60-90 seconds after I turn him on till he powers down with the brain battery notification. I searched this forum but could not come up with any answers, so I thought I would post a thread in he hopes that one of you kind people might help me out.