MLS Destinator Talk&Drive 43SL Compatible Battery 3.7V 800mAh

MLS Destinator Talk&Drive 43SL — 3.7V Li-ion Replacement Battery

This 3.7V 800mAh Li-ion cell replaces the internal battery in the MLS Destinator Talk&Drive 43SL and Talk&Drive 43SL A portable GPS navigators. It fits the slim battery bay directly and matches the original voltage and form factor at 47.90 x 44.10 x 5.55mm. Capacity is rated at 800mAh (2.96Wh) — identical to the factory cell.

• Talk&Drive 43SL and 43SL A compatibility: Both variants share the same battery bay dimensions, connector orientation, and voltage rail. The BMS in each unit reads the same charge curve, so there is no handshake difference between the two models with this cell.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Talk&Drive platform. The protection circuit held cutoff voltage correctly and the BMS accepted charge without error flags or thermal events.
• First-fix cold start after fitting: After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. Removing battery power wipes the GPS receiver's ephemeris data, so the first fix after a swap is a cold start — allow 5 to 10 minutes outdoors with a clear sky view.

GPS accuracy reduced at low battery on the Talk&Drive 43SL

When cell voltage drops below roughly 3.5V, some GPS receivers reduce radio-frequency sensitivity to shed power load. On the Talk&Drive 43SL this shows up as wider position error or brief signal dropout during active navigation. The position scatter is not a software fault — it clears once the battery is charged back above 3.6V. If accuracy issues appear regularly, check the battery indicator first before suspecting antenna or firmware problems.

Talk&Drive 43SL shuts off without warning before the indicator hits zero

The on-screen battery indicator on this unit is calibrated to the original cell's discharge curve. A worn original cell loses capacity while the indicator logic stays fixed, so the displayed level and actual remaining voltage drift apart. After fitting a fresh cell, the indicator re-learns the curve over two or three full cycles. Until then, the unit may cut off at what appears to be 20–30% remaining — this is the voltage threshold at approximately 3.4V being hit before the visual warning catches up.