It has a number something like MM40002, let me know what it is and I might be able to help.
Answer HERE, don't start another thread
acorn
February 2011
Try Google but then: Bring the battery to an Electrical parts distributor [like Baldwin Hall and others in your area - check yellow pages] and they can look at it and probably find a battery of similar size and rating. ...or send me the approx size, Manufacturer's name and part number and possibly a photo of it and I'll check for you... aslo try Radio Shack...