The 53963 is a MOTOROLA ORIGINAL BATTERY. The 53963 will fit the DTR550 and DT650 Motorola 3.6V 1200mAh Li-ion battery for DTR550, DT650 and DTR410. The 53963 battery may also be known as 53963, SNN5706, SNN5706A, SNN5706B. STANDARD CAPACITY LITHIUM ION BATTERY Have a spare battery ready for when you need it. Rechargeable battery provides up to 14.5 hours of battery life per full charge. (Based on 5-5-90 Duty Cycle) Fits With Standard Door: DTR550, DTR650. Compatible Radio Models: DTR410, DTR550, DTR650, Nextel i730, i733, i710, i605, i760, i355, i365, i325, i315, i305, i265, i275, i285, i215, i205, i95, i90, i60, i88s, i85s, i58sr, i55sr, i50sx, i35s, i30sx, i560, i850, i860, i870, i920, i930 and i736 phone models</p><p><b><i>PLEASE NOTE:</b> Since this product is a Lithium Ion Battery and due to FAA regulation, this item is restricted to ground transportation in the lower 48 contiguous states and cannot ship to Alaska, Hawaii or Puerto Rico.</i></p>