(1) One Motorola Rechargable memory backup battery for XTS5000 XTS2500 and XTS1500. 6003710K08 MS621 6071520M01. If your clock on your radio keeps losing time this is what you need to change. There are instructions on the internet to help you in changing this. The battery is located on the back of VOCON board. I won't take any responsibility for the damage you cause to your radio. This is new old stock. This a stock photo and you will receive an identical item.