Generic 4 Pack 1500mAh Cordless Phone Battery for Panasonic P-P511 Compatible for Panasonic P-P511 Type 24 KX-TGA270S KX-TG2740 KX-TG2357 KX-TG5240,Energizer P-P511, GE TL-26400 This replacement battery has an integrated microchip that prevents overcharging and lengthens battery life. High quality 3.6V 1500mAh Standard battery. Works with multiple models. 100% compatible with Original Battery. Great bargain with excellent quality guaranteed.