The UB-54344-L replacement lithium-ion battery pack is 100% compatible with the Trimble TR-R8 GPS, R6, R7, R-8, R8 GNSS, 5700, 5800, 29518, and MT1000 GPS Receiver Systems. This 2600 mAh capacity rated battery pack is guaranteed to match and often exceed the device Run Time and Battery Life of the Trimble 54344, 92600, and 52030 batteries. All of our Batteries are manufactured using performance grade power cells from Panasonic which are proven to deliver maximum battery run time and total cycle life.