CLARION MAP 770 Replacement Battery 3.7V 1250mAh BPLP1200

CLARION MAP 770 / MAP780 — 3.7V Li-ion Replacement Battery (BPLP1200 11-B0001MX)

This is a 3.7V 1250mAh (4.63Wh) lithium-ion cell for the CLARION MAP 770, MAP770, and MAP780 in-vehicle GPS navigator. It replaces OEM part BPLP1200 11-B0001MX and restores operation when the original cell no longer holds charge. Voltage and physical dimensions match the factory spec exactly — 50.09 × 36.67 × 6.53mm.

• MAP 770 and MAP780 platform fit: Both units share the same internal battery bay dimensions, connector pinout, and charge management circuit. One cell covers both models without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a MAP 770 unit. The BMS accepted the charge handshake correctly at first connection and held voltage within expected range across full discharge to cutoff.
• First-fix satellite acquisition after swap: After fitting this cell, power the MAP 770 fully on outdoors and allow it to acquire a satellite fix before driving. A cold start — triggered by complete power removal — takes 5–10 minutes for the first GPS lock. Subsequent warm starts drop to under a minute once the almanac data is cached.

GPS accuracy reduced at low battery on the MAP 770

When cell voltage drops toward the lower threshold, the MAP 770 reduces receiver sensitivity to cut power draw. This shows up as positional drift or loss of turn-by-turn accuracy even though the unit appears to still be running. It is not a firmware bug or antenna fault — it is a deliberate power-saving step tied directly to battery voltage. Keeping the cell above 3.6V under load prevents this mode from activating.

MAP 770 shuts off without warning before the battery indicator hits empty

This happens when the on-screen battery gauge is reading from a calibration profile built around the original cell. A replacement cell — even at the same nominal voltage — has a slightly different discharge curve until the device recalibrates. The MAP 770 hits its hard voltage cutoff before the visual indicator catches up, making the shutdown look sudden. Run two to three full charge and discharge cycles to let the gauge resync to the new cell's actual curve.