If you remove the 4 screws to the top of the RBN-300 battery holder, then separate the halves, you will see a small IC board charge controller in the top 1/2. Remove the 3 screws to it, gently remove the board & (with a magnifier) look at the contact to the side of the board from the power plug (close to the LED light.
If you wiggle the low volt power plug, I expect you will see that the solder joint has broken on the board edge. Resolder & reassemble -I use hot melt glue to help support the plug to avoid re-breakage between plug & board.
This may fix your problem unless the erratic circuit connection has killed either the control board or you battery.
BCinBC
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This battery sucks. it dies after about 10 minutes. i can't find a new one online anywhere
My battery has never been able to be charged. It lights up like it's charging, but cannot hold it to play a movie.
I used my DVD unit once, then it sat in a drawer for about a year. I pulled it out last week for a trip, and was unable to charge the battery at all.
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