Juniper Mesa 2 GPS Replacement Battery 3.7V 10400mAh

Juniper Mesa 2 / MS2 — 3.7V Li-ion Replacement Battery (25260, 27575)

This 3.7V Li-ion battery replaces the original pack in the Juniper Mesa 2 and MS2 handheld GPS receiver, a field instrument used for surveying, mapping, and geospatial data collection. Capacity is 10400mAh (38.48Wh), matching the standard Mesa 2 battery footprint. It fits the standard Mesa 2 and the 7" Mesa 2 variant.

• Mesa 2 and 7" Mesa 2 compatibility: Both the standard and 7" Mesa 2 share the same battery bay dimensions, connector pinout, and BMS communication protocol — the same pack works across all three designations without modification.
• Bench tested on actual hardware: We ran this pack through a Mesa 2 charge cycle and monitored BMS handshake at power-on. The protection circuit responded correctly to the instrument's charge termination signal, and cell voltage held within spec across load variation during GPS acquisition and active logging.
• First deployment on a new pack: After installing, run a full calibration cycle through the Mesa 2 instrument menu before heading into the field. The device maps battery state during that sequence, and skipping it causes premature low-battery warnings during your first survey session even when the pack is near full charge.

Mesa 2 BMS lockout after the pack sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the Mesa 2 pack drops below roughly 2.5V per cell, the BMS enters a deep-discharge lockout state and the instrument will not power on or accept a charge. This is a protection function, not cell failure. To recover, connect the Mesa 2 to a wall charger and leave it for 20–30 minutes — the charger applies a low-current trickle that nudges the cell voltage above the BMS recovery threshold, typically around 2.9V per cell. Once the charge LED activates normally, the pack has cleared lockout and will charge to full.

GPS data logging session resets or freezes mid-survey with battery percentage still showing high

Under sustained GPS acquisition combined with active data logging, the Mesa 2 draws more current than during standby — this sustained load can cause a momentary voltage dropout if the cell is aged or the BMS trips on a brief current spike. The instrument interprets this as a power fault and resets, even if the displayed percentage looked healthy moments before. A new pack with full cell capacity handles the sustained draw without the sag that triggers the reset. If the issue persists after fitting a fresh battery, check that the SD card and any connected peripherals are not adding combined draw that pushes the BMS threshold.