Patented Renu-It disposable battery regenerator and cell phone charger regenerates alkaline NiMH or NiCd batteries has 8 charging docks and will recharge 6 AA AAA C and D batteries and 2 9-volt batteries. USB connection allows you to charge any cell phone. The Renu-It protects against overcharging overheating short-circuiting and polarity-reversal issues.