Black & Decker HPNB24 24-Volt Battery for NST1024 String Trimmer and NHT524 Hedge Trimmer Black & Decker HPNB24 24-volt battery easily replaces old batteries High-performance 24V battery extends run-time for high-drain electric outdoor power tools Compatible with all 24V Black & Decker Outdoor power tools for interchangeable convenience and value High output nickel cadmium battery cells with "no memory" technology Can be used as a spare for larger yards or jobs Black & Decker HPNB24 24-volt battery easily replaces old batteries Can be used as a spare for larger yards or jobs This new system, powered by a 24-volt battery, extends runtime and performance for these outdoor tools This 24-volt battery is 100 percent compatible with all Black & Decker 24-volt Tools High output nickel cadmium battery cells with "no memory" technology