ATC Cordless Phone Battery 3.6V Ni-MH for Motorola MD7151 MD7161 MD7261 SD4501 SD4502 SD4550 SD4551 SD4561 35859 35858 35829 High Quality Replacement product Internal cells of higher capacity than original battery Factory Fresh, however battery is rated at 10 year shelf life - Get a spare Works with multiple models, listed below - Use CTRL+F to find your model Extended talk time / Battery is immune to negative "memory effect"