I don't know much about battery repair, but I found this link, I hope it could be of some assistance - http://www.instructables.com/id/Makita-18v-LXT-Lithium-ion-Battery-Repair/ Two years ago I ordered this kit (on a recommendation from a friend) - http://www.gasweld.com.au/makita-dlx2055t-combo-kit The battery still works like it was brand new, and the DHP481Z is immaculate.