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Texas Instruments 3.6L43BPA TI-Navigator Compatible Battery 3.7V 5200mAh

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Fits Texas Instruments TI-Navigator handsets; replaces OEM part 3.6L43BPA.
3.7V 5200mAh lithium-ion cell delivers sustained power for wireless classroom polling and data collection sessions.
Barrel connector seats into the navigator's battery bay with a spring-loaded locking tab; verify seating until tab clicks.
We bench-tested this pack in a TI-Navigator unit across multiple quiz and survey cycles; BMS accepted charge without fault codes.
After installing, run a full calibration cycle through the instrument menu before classroom deployment — the navigator maps battery state during calibration, and skipping this step causes premature low-battery warnings during active polling sessions.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

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Voltage

3.7V

Amp

5200mAh

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.

Compatible Models

TI-Navigator

Replaces Part Numbers

3.6L43BPA

Technical Specifications

Voltage3.7V
Amp Hours5200mAh
Capacity5200mAh
Rate19.24Wh
Net Weight104g /3.67 oz
Gross Weight129g /4.55 oz
Approximate Weight129g /4.55 oz
Dimension 73.00 x 41.20 x 21.60mm

Product Highlights

  • Brand: Texas Instruments
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The TI-Navigator hub sat in a storage cupboard for most of the summer and now it won't charge at all — is the battery dead?

After months unused, the cell voltage can drop below the threshold the charger needs to initiate a charge cycle, and the BMS enters a sleep state to prevent damage. Connect the hub to its charger for 20–30 minutes anyway — some chargers apply a low recovery current that wakes the BMS before the charge LED activates. If nothing happens after 30 minutes, the original pack has likely deep-discharged past recovery, and a replacement is the fix. A new cell at resting voltage will begin charging normally as soon as it is connected.

Student handhelds are showing full battery on screen, but readings and responses are cutting out or resetting mid-activity — what's causing that?

This is voltage dropout under sustained sensor and radio load, not a display fault. The cell voltage sags below the processor's stable operating floor during extended activity, triggering a soft reset even though the indicator hasn't caught up. The percentage display on the Navigator lags real cell voltage under load, so a "full" reading is not reliable on a degraded pack. Replace the battery and run a complete class activity cycle so the system can re-map the charge curve against actual operating load.

The TI-Navigator powered on fine, but the battery percentage is jumping around erratically every time the hub reboots — is the new battery faulty?

This is normal behaviour for the first few power cycles after fitting a new cell. The Navigator's charge indicator recalibrates its voltage-threshold map each time it boots, and until it has logged enough charge and discharge data from the new cell, the percentage readout is an estimate based on the old cell's curve. Run two or three full activity sessions — power on, full class use, charge to 100% — and the indicator will stabilise. If the percentage is still erratic after three cycles, check the battery contacts on the hub for corrosion or debris.

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