About this replacement
BlueMedia BM6380 — 3.7V Li-ion Replacement Battery (BALI-BM63-DMED)
This is a 3.7V, 1400mAh Li-ion cell for the BlueMedia BM6380 portable GPS navigator. It fits the BM6380, BM-6380, and BM-6280 models. Dimensions are 50.93 × 36.91 × 5.57mm — measure your existing cell before ordering if you are unsure.
- BM6380 / BM-6280 platform fit: These models share the same battery bay dimensions, connector pin-out, and 3.7V supply rail. The BMS handshake on both units reads the same cell chemistry, so one part number covers both.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the BM6380 platform. The onboard BMS accepted the cell without fault codes, held termination voltage at 4.2V, and cut off cleanly at the low-voltage threshold.
- Cold-start satellite acquisition after swap: After fitting this cell, power the GPS fully on outdoors before driving. A full power interruption clears the assisted GPS cache, so the receiver runs a cold start — expect 5 to 10 minutes for first fix rather than the sub-minute warm start you had before.
GPS accuracy reduced at low battery on the BM6380
When cell voltage drops toward 3.5V, the BM6380 firmware reduces power to the GPS receiver module to extend operation. Lower receiver power means weaker signal processing, which widens position error. You may notice the position dot drifting or snapping between points on the map. Keeping the battery charged above 3.7V maintains full receiver sensitivity and position accuracy.
BM6380 shuts off without warning before the battery indicator reaches empty
The low-battery indicator on the BM6380 is calibrated to the original cell's discharge curve. A new cell — or an aged one with a shifted curve — can hit the hardware cut-off voltage before the on-screen indicator reaches one bar. The device does not crash; the BMS simply trips the cut-off at approximately 3.0V. Run two or three full charge-discharge cycles so the firmware can re-map the indicator to the new cell's curve.