1500mAh Rechargeable Cordless Telephone Battery for Panasonic P-P511 PP511A N4HKGMA00001 KXTGA510M KX-TGA510m KX-TGA510A KXTGA510 KX-TGA273S KXTGA273 100% compatible with original battery. Free shipping. It comes with a 1 year warranty. No memory effect battery. longer running time & Enviromental friendly.