Insten 3.6V Replacement Ni-MH Battery Compatible With Panasonic P-P511 Cordless Phone TYPE 24 New Stay connected with families and friends by getting extra battery power today. This replacement battery has an integrated microchip that prevents overcharging and lengthens battery life. Best replacement for the original battery with comparable standby and talk time. Great bargain with excellent quality guaranteed. Color: Black. Voltage: 3.6V. Accessory ONLY, phone not included.