Replacement Ni-MH Cordless Phone Battery for Southwestern Bell S60508. Restore the long-lasting power to your cordless phone with this high-quality 3.6V, 600mAh battery (2.16Wh). Its Ni-MH chemistry provides reliable performance. Dimensions are 42.64 x 30.00 x 14.45mm. A perfect fit and essential upgrade for your compatible Southwestern Bell device.