About this replacement
Texas Instruments TI-Navigator — 3.7V Li-ion Replacement Battery (3.6L43BPA)
This is a 3.7V 5200mAh Li-ion battery for the Texas Instruments TI-Navigator wireless classroom system. It fits the handheld access point devices that connect students and teachers during live assessments and data collection sessions. The OEM part number is 3.6L43BPA.
- TI-Navigator handheld access points: These units share a single battery platform across the Navigator hub ecosystem — same voltage rail, same connector pinout, and the same BMS handshake protocol that the base station uses to verify pack state before enabling wireless transmission.
- Bench tested on actual hardware: We cycled this pack through Navigator hub pairing sequences and monitored BMS response during wireless sync bursts. The protection circuit held stable across repeated connection events without triggering low-voltage cutoff.
- First-session calibration tip: After fitting this battery, run a full class session or at least one complete activity cycle before relying on the charge indicator. The TI-Navigator maps battery state against actual load during use, and skipping this step causes premature low-battery warnings to fire during your first real lesson.
Why the TI-Navigator hub drops its wireless link mid-session
When the hub polls multiple student handhelds simultaneously, the radio module draws a short current burst that a degraded or partially discharged cell cannot sustain. The BMS reads this spike as an unsafe discharge event and cuts output to protect the cell. A new pack with a full charge handles these polling bursts without interruption. If drop-outs persist after fitting a fresh battery, check that the hub firmware is current — older firmware versions poll at higher burst rates than necessary.
TI-Navigator shows a charged indicator but shuts off when USB data transfer starts
USB data transfer to a PC adds a combined load — radio, processor, and USB controller all active at once — that can exceed what a worn cell delivers even when the display shows a healthy percentage. The voltage sag under that combined draw crosses the BMS cutoff threshold before the indicator catches up. Fit the replacement pack and initiate a full transfer immediately after a complete charge cycle. Confirm the pack is reading at or above 4.1V before starting any USB sync session.