Jensen JTB240 Cordless Phone Battery for AT&T 2419, 2420, 80-5542-00-00, 80-5543-00-00 Cordless Phone Battery for AT&T 2419, 2420, 80-5542-00-00, and 80-5543-00-00 Offers long life and consistently reliable performance Advanced engineering and state-of-the-art manufacturing 500 mAh, 3.6 V