Fix a Dead Drill Battery That Wont Charge- Don't Throw it Away! - YouTube
Repair Lithium Li-ion 3.0ah 21V Rechargeable Power Tool Batteries Pack for Drill, Hammer, Wrench, Angle Grinder, Water Gun. Multi-Function Port Tools - China Lithium Batteries and Makitas Platform
How to revive a dead rechargeable power tool battery easily - YouTube
Have a Cordless Tool Battery Won't Recharge? You Can Fix That.