Trimble PM5 Mobile Mapper 100 Replacement Battery 3.7V 10200mAh

Trimble Mobile Mapper 100 / MobileMapper 120 — 3.7V Li-ion Replacement Battery (PM5)

This 3.7V 10200mAh Li-ion battery replaces OEM part numbers PM5, 206402, 206402A, 206402B, and 206402C. It fits the Trimble Mobile Mapper 100, MobileMapper 120, ProMark 100, and ProMark 120 — handheld GPS survey instruments used for mobile mapping and geospatial data collection in the field. Capacity is 37.74Wh.

• Mobile Mapper and ProMark platform fit: These models share a common battery bay format, connector pinout, and BMS handshake protocol across the 100 and 120 series. One pack covers all four instruments because the voltage rail and communication lines are identical across the platform generation.
• Bench tested on actual hardware: We cycled this pack through the Mobile Mapper 100 under active GPS logging with GNSS antenna powered. The BMS held stable through satellite acquisition bursts and logged no overcurrent trips during sustained positional fix sessions.
• First-boot calibration cycle: After installing this pack, run a full calibration cycle through the instrument's system menu before field deployment. The Mobile Mapper maps battery state during that calibration pass — skipping it causes the low-battery warning to fire early on your first survey session, even with a fully charged pack.

BMS cutoff when the Mobile Mapper 100 initialises its GNSS receiver at power-up

When the Mobile Mapper 100 powers on, the GNSS receiver draws a short but sharp current spike as it initialises the antenna and begins satellite acquisition. An aged or partially discharged original battery often can't supply that spike without dropping below the BMS undervoltage threshold, which trips the protection circuit and cuts the pack off instantly. This pack's higher cell capacity means internal resistance stays lower across the discharge curve, so the startup spike doesn't drag terminal voltage below cutoff. If the instrument shuts off at the boot screen specifically — not mid-session — this is the most likely cause.

Device powers on but shuts down when USB data transfer to PC starts

USB data transfer adds a second load on top of the active GNSS session — the USB controller, display backlight, and file system all draw simultaneously. A battery weakened by age or cycle fatigue can't sustain the combined load, and the voltage sags enough to trigger an automatic shutdown mid-transfer, often corrupting the log file. This is a load-combination failure, not a software fault. Charge the pack to full (4.2V at the cell), then initiate the transfer immediately — don't start it from a mid-charge state.