Well I ain't had to bad a luck with the Makita packs as I keep them rotated and charge often but what annoys me if this one battery has been hold a charge great and its never had issues with charging. Well I take it of the impact and put it straight on the Charger and I get the alternating flashing lights! I would love to know why the charger suddenly decides my battery has had enough? Its no wonder Makita took so long bringing out the new battery design. They are making a killing on packs that decide they ain't good anymore.