I picked up an old Aladin Sport dive computer at a garage sale recently. The battery was dead so I took it to the Scubapro dealer to get it changed out. He told me it would have to go to the factory to change the battery because it was so old. He told me that it would be about $150-160 to do that. I am curious...is it really that much to get the battery changed on that old computer? I don't mind paying the price for a cheap backup (I dive with an Aeris T3), but that seems a bit excessive.