One of my Makita LXT Lithium-Ion batteries will no longer charge. The charger goes to error when I try to charge it. It has been charged probably hundreds of times so I think it had a good life. (I bought shortly after the LXT came on the market.)

Anyone rebuilding these, or do I need a replacement? I can't find a rebuilder in my onlline searching. I did find a generic replacement on Ebay for around $50 instead of the typical $99 or so for a genuine Makita replacement.