Trimble TSC3 11.1V Replacement Battery ACCAA-112 3400mAh

Trimble TSC3 / Ranger 3 Series — 11.1V Li-ion Replacement Battery (ACCAA-112)

This 11.1V 3400mAh Li-ion battery replaces the OEM pack in the Trimble TSC3 handheld data collector and the Ranger 3, Ranger 3L, and Ranger 3XE field controllers. It matches the original voltage rail and connector pinout to maintain BMS handshake across all listed models. Capacity is 3400mAh (37.74Wh), sourced directly from the product specification.

• TSC3 and Ranger 3 platform fit: These controllers share the same battery bay dimensions, connector layout, and 11.1V three-cell architecture. The BMS communication protocol is identical across the TSC3, Ranger 3, Ranger 3L, and Ranger 3XE, so one pack fits all listed variants without firmware or hardware modification.
• Bench tested on actual hardware: We ran this pack through the TSC3 power-on sequence and monitored BMS handshake at initialisation. The protection circuit responded correctly to the controller's state-of-charge query, and the cell voltage held within spec under sustained GPS and display load.
• Field calibration cycle before first deployment: After fitting this pack, run a full calibration cycle through the TSC3 instrument menu before heading into the field. The controller maps battery state during that cycle, and skipping it causes premature low-battery warnings to fire during the first logging session — a known behaviour with any new cell fitted to this platform.

TSC3 shutting down mid-logging session despite showing charge remaining

The TSC3 draws a variable load — GPS engine, cellular modem, and backlit display can all spike simultaneously during active data collection. If the cell's internal resistance has climbed due to age or cold temperatures, voltage sags below the BMS cutoff threshold under that combined load even when the displayed percentage reads above 20%. The controller interprets this as a fault condition and cuts power to protect the circuit. Fitting a fresh pack with lower internal resistance resolves the sag; if the issue persists on a new pack, check that ambient temperature is above 0°C, as Li-ion output current drops sharply below freezing.

Pack will not charge after the TSC3 sat unused in a carry case for months

Li-ion cells self-discharge over storage, and if the TSC3 was left powered off with a partially depleted pack, the cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or 7.5V total for an 11.1V three-cell pack. Below that threshold, the BMS enters sleep mode and blocks the charge circuit to prevent damage. To recover, connect the charger and leave it for 45–90 minutes without disconnecting — most chargers apply a low trickle current that nudges the cell voltage back above the recovery threshold before switching to normal charge mode. If the charger shows no activity after two hours, the cells have discharged too far to recover and the pack needs replacement.