I would talk to Eli over at insight central. He is selling completely new battery packs under the name Bumblebee batteries I think. He requires a core, so you could probably trade him your bad stick for a good one for a reasonable price. For what it is worth, I used two 90V 300mA LED power sources as an overnight charger to recover battery performance. It has worked quite well, although my battery was not nearly as deteriorated as yours.
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