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Trimble Mobile Mapper 100 Replacement Battery PM5 3.7V 7800mAh

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From $39.99 USD $49.99
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Fits Trimble Mobile Mapper 100, MobileMapper 120, ProMark 100, ProMark 120 — replaces OEM part numbers PM5, 206402B, 206402C, 206402A, 206402.
3.7V, 7800mAh lithium-ion cell delivers 28.86Wh — sustains GPS and imaging sensor draw through full field survey sessions without mid-task shutdown.
Connector is a proprietary Trimble two-pin interface with positive and negative contacts; battery seats flat into the instrument grip with a spring-loaded retention tab.
We ran full-discharge cycles on a Mobile Mapper 100 unit — BMS accepted the new pack without lockout, voltage held steady during continuous GPS logging and image capture.
After installing this cell, run the instrument's internal battery calibration routine before field deployment — the system maps initial voltage state during calibration, and skipping this step causes inaccurate low-battery warnings on your first survey run.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

7800mAh

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

This 3.7V, 7800mAh Li-ion battery replaces OEM part numbers PM5, 206402A, 206402B, 206402C, and 206402. It fits the Trimble Mobile Mapper 100, MobileMapper 120, ProMark 100, and ProMark 120 handheld GPS and imaging units used in field surveying and geospatial data collection. Capacity is sourced from product data at 28.86Wh.

  • Mobile Mapper and ProMark platform fit: The Mobile Mapper 100, MobileMapper 120, ProMark 100, and ProMark 120 share the same battery bay geometry, connector pinout, and BMS handshake protocol — one pack covers all four devices without modification.
  • Bench tested on actual hardware: We cycled this pack through the MobileMapper 120 under sustained GPS logging and simultaneous imaging load. The BMS held voltage without dropout and responded correctly to the instrument's charge termination signal.
  • First-field deployment tip: After installing this pack, run a full calibration cycle through the instrument's system menu before heading into the field. The device maps battery state during that process — skipping it causes premature low-battery warnings to fire well before the pack is actually depleted.

BMS cutoff when the GPS module initialises at startup

The Mobile Mapper 100 pulls a sharp current spike the moment its GPS and imaging modules power up together. On a degraded or deeply discharged pack, that spike can trip the BMS overcurrent threshold before the device finishes booting. The instrument then appears to shut off immediately after the splash screen, even though the battery showed a charge. This pack's BMS is rated to handle the combined initialisation draw without tripping — confirmed across repeated cold-start cycles on the bench.

Pack will not charge after the unit sat unused in a carry case for months

Li-ion cells self-discharge slowly during storage. If the pack drops below approximately 2.5V per cell, the BMS enters sleep mode and blocks the charge circuit as a protection measure — the charger sees no load and the device shows nothing on screen. Place the battery in the cradle charger and leave it connected for at least 30 minutes without interruption; most BMS circuits recover from sleep and resume normal charging once the charger's trickle current nudges the cell voltage above the 2.8V re-initialisation threshold.

Compatible Models

Mobile Mapper 100 MobileMapper 120 ProMark 100 ProMark 120 ProMark 200 ProMark 220 Geo 5T GeoExplorer 5

Replaces Part Numbers

PM5 206402B 206402C 206402A 206402

Technical Specifications

Voltage3.7V
Amp Hours7800mAh
Capacity7800mAh
Rate28.86Wh
Net Weight152g /5.36 oz
Gross Weight222g /7.83 oz
Approximate Weight222g /7.83 oz
Dimension 68.25 x 59.50 x 21.00mm

Product Highlights

  • Brand: Trimble
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My MobileMapper 120 shuts down mid-session while logging GPS data, but the battery indicator was still showing over half charge — what's happening?

Sustained GPS logging combined with active imaging creates a continuous draw that causes voltage to sag under load even when the resting charge reads high. When that sag crosses the BMS's low-voltage cutoff threshold, the instrument shuts off — the indicator before shutdown reflects resting voltage, not loaded voltage. This is more common with aged cells but can also appear with a new pack if the instrument hasn't mapped the battery's state yet. Run the calibration cycle through the system menu first, then retest in the field.

The Trimble Mobile Mapper 100 powers on fine but shuts off the moment I connect it to a PC for data transfer — why?

USB data transfer adds a secondary draw on top of the active GPS and file-system processes already running. If the pack's voltage is already marginal from a field session, that combined load pulls cell voltage below the BMS cutoff and the unit drops out. Charge the pack fully before connecting to a PC for post-survey data offload, and verify the cell is sitting at or above 4.1V before initiating a large file transfer.

After replacing the battery, my ProMark 120 shows a wildly inaccurate charge percentage that jumps around on every reboot — how do I fix it?

The instrument's battery state indicator calibrates itself to the voltage curve of the installed pack. With a new pack, it takes one or two full charge-discharge cycles before the firmware accurately maps percentage to actual cell voltage. Force a full charge to 4.2V, use the device in the field until the low-battery warning triggers, then charge back to 4.2V without interruption. After that cycle the percentage reading stabilises and tracks correctly across subsequent sessions.

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