This comprehensive guide provides detailed instructions on how to repair and rebuild NiCad batteries for cordless toothbrushes. It encompasses a step-by-step approach to reviving your old NiCad batteries, saving you significant costs associated with replacing them. The guide covers everything from identifying the problem to disassembling and reassembling the battery pack, as well as troubleshooting common issues. With this guide, you can extend the life of your cordless toothbrush batteries and avoid the expense of purchasing new ones.