Combine batteries to increase voltage for suitable projects, but match similar capacity and voltage batteries.
Always monitor temperature during use—overheating can be dangerous.
Use battery holders or enclosures for safer, long-term projects.
Possible Applications
LED lighting for camping or emergency use
School or home electronics projects
Small motor-powered devices
Low-energy sensors for experiments
Conclusion
Old cell phone batteries don’t have to be waste—they can be a creative energy source. With care, caution, and imagination, these tiny power packs can bring your DIY projects to life while reducing electronic waste. A little innovation can go a long way!
