OK, not that I located the owners manual for my specific GP7, it says it has PS 2.0 and to not use the alkaline battery as it may damage the 3 volt battery charging unit. Hopefully it is not to that point yet. I have only tried to turn it on a few times. I will pull out the alkaline one right now and put back in the ailing 9V rechargeable...but I don't understand the 3V charging of a 9V battery. The owners manual is not specific on how that works or if there is a second battery in there somewhere. The battery that was in mine was a 9V NiMh, not a 9V NiCad. More questions and possibilities I guess. I will try the track charging method for a few hours as they suggest. The sound never failed though, it just kept clicking upon hitting reverse...a sign of low power.
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