Royaltek RBT-2010 BT GPS Replacement Battery NTA2236 3.7V

Royaltek RBT-2010 BT GPS — 3.7V Li-ion Replacement Battery (NTA2236)

This is a 3.7V 1800mAh Li-ion cell for the Royaltek RBT-2010 BT GPS portable navigator. It replaces part number NTA2236 and fits the RBT-2010 directly. The cell measures 52.98 × 35.39 × 11.61mm and delivers 6.66Wh per charge cycle.

• RBT-2010 BT GPS platform fit: The RBT-2010 runs a single-cell 3.7V Li-ion architecture. This cell matches that voltage rail, physical footprint, and connector orientation. No adapters or modifications are needed to seat the battery in the chassis.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the RBT-2010. The BMS accepted the cell without fault flags, held charge correctly, and the device reached full operating voltage without thermal events or cutoff triggers during the test run.
• Cold-start satellite acquisition after fitting: After fitting this cell, power the GPS on outdoors before relying on it for navigation. A full power interruption forces a cold start — the receiver clears its ephemeris data and rebuilds satellite lock from scratch. Allow 5 to 10 minutes for first fix acquisition in open sky before your first route.

GPS accuracy reduced as battery voltage drops below threshold

Some GPS receivers scale back RF front-end sensitivity when battery voltage drops toward the low cutoff point. On the RBT-2010, this can appear as increased position error or slower track updates before the device shuts off. The receiver is drawing less current to protect the remaining cell capacity, which reduces signal processing headroom. If position accuracy degrades mid-route, check the battery indicator — if it shows one bar or less, the cell is already in the low-voltage protection zone.

Device shuts off without a low-battery warning on the RBT-2010

This happens when the battery indicator is uncalibrated against the new cell's discharge curve. The original firmware mapped its voltage thresholds to the aged capacity of the depleted OEM cell. A fresh 1800mAh cell has a flatter discharge curve in the mid-range, so the indicator reads higher than actual remaining capacity until recalibration. Run two or three full charge-to-cutoff cycles — the device recalibrates the gauge across those cycles and the low-battery warning will re-align to the correct voltage threshold near 3.2V.