Discover the reliability of the NEC SL2100 GX77/ML440 Handset Battery Pack, designed specifically for your NEC handsets. This proprietary battery size ensures optimal performance and better reliance. It charges faster than other batteries, providing you with quick readiness. Enjoy the convenience of a rechargeable battery that outlasts disposable ones, ensuring longer usage times between charges. It's the perfect spare to keep your communication uninterrupted. Upgrade your handset today and experience the difference!