Found similar product in stock: HP Compatible Battery 4 Cell 48Wh (MPN: 851610-855)
ID: 100009448
ASSY-BATT 3C 48WH 4.21AH LI RR03048XL-PR
The HP 851610-855 is a 4-cell lithium-ion replacement battery for the HP mt21 Mobile Thin Client. It fits inside the computer as its battery, rather than serving as an external power adapter.
With an energy capacity of 48 WHr and a charge capacity of 4.21 Ah, this spare part is identified by the same number used in the HP mt21 service guide. These specifications help match it to the documented battery assembly.
The service guide shows the battery secured with a Torx T8 2.5×5.0 screw. Once the screw is released, the lower edge is rotated upward to remove the battery. This describes the access and removal method for servicing the part.
For replacement or service in the HP mt21, the computer is shut down and external devices and AC power are disconnected first. The service doors, keyboard, top cover and card reader board are then removed before the battery. These steps place the battery within the computer’s internal service process.
