How To Revive & Fix a Bad NiCd Rechargeable Tool Battery - Part 1 HD

** THIS WILL ONLY WORK FOR NICD BATTERIES - DO NOT DO IT TO NIMH OR LION ** This video will show you how to fix a bad or old NiCd battery for your cordless power tools. You need to have a power source that is double the voltage of your current battery. So if your battery is 18V, then you need a power source at 36V. You can use other cordless batteries and connect it in series. The procedure is this: 1) let your bad battery drain to no voltage 2) connect the (-) lead of the 36V to the (-) lead of the 18V battery 3) quickly tap the (+