Carlson RT3 Data Collector Compatible Battery 3.7V 10400mAh

Carlson RT3 Data Collectors — 3.7V Li-ion Replacement Battery (1013591-01)

This 3.7V, 10400mAh Li-ion battery replaces part number 1013591-01 in the Carlson RT3 and RT3 Data Collectors. These are field-grade surveying instruments used for topographic surveys, construction layout, and GPS positioning. The RT3 draws sustained current during active GNSS logging and sensor polling, so cell capacity and BMS response both matter on multi-day sites.

• RT3 and RT3 Data Collector compatibility: Both the RT3 and RT3 Data Collector variants share the same battery bay, connector pinout, and BMS handshake protocol, so one part number covers the platform. The instrument communicates with the pack over a data line to read state-of-charge — the cell count, voltage rail, and connector are matched to that dialogue.
• Bench tested on actual hardware: We cycled this pack under simulated GNSS and sensor logging loads. The BMS held the voltage rail steady across sustained draws and triggered protection correctly at low-cell cutoff without locking out the instrument controller.
• First-deployment calibration: After fitting a new pack, run a full calibration cycle through the RT3 instrument menu before heading into the field. The RT3 maps battery state during that routine — skip it and the display will show premature low-battery warnings from the first measurement session onward.

BMS lockout after the RT3 sat unused in a carry case for months

Li-ion cells self-discharge slowly during storage. If the RT3 sits unused long enough, cell voltage drops below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit locks out to prevent damage. At that point the instrument shows nothing when powered on, and a standard charger may not trigger charge current because the pack looks dead to the charger's detection circuit. Place the battery on a compatible charger that supports recovery or trickle-charge mode and leave it for 30–60 minutes before attempting a normal charge cycle. Once cell voltage climbs above the recovery threshold, the BMS resets and normal charging resumes.

RT3 display showing an inconsistent charge percentage after swapping the battery

The RT3 uses a voltage-threshold method to estimate state-of-charge, not a cycle-counting chip. When a new pack is installed, the instrument's internal reference hasn't yet mapped the discharge curve of the new cells, so the percentage reading jumps or reads incorrectly for the first few cycles. This corrects itself after two or three full discharge-and-charge cycles as the instrument relearns the voltage-to-capacity curve. Run the calibration cycle in the instrument menu after fitting the pack, then allow one full field discharge before trusting the percentage figure.