Medion MDPNA 150 Replacement Battery 3.7V 1250mAh

Medion MDPNA 150 / MDPNA 470 — 3.7V Li-ion Replacement Battery (541380530006)

This 3.7V, 1250mAh Li-ion cell replaces the original battery in the Medion MDPNA 150 and MDPNA 470 portable GPS navigators, along with the MD95157 and MD95243 variants. It matches the original form factor at 50.00 × 36.60 × 6.60mm and fits the existing battery bay without modification. OEM part numbers covered include 541380530006, BL-LP1230/11-D00001U, and BP-LP1200/11-D0001 MX.

• MDPNA 150 / MDPNA 470 platform fit: These models share a common 3.7V single-cell architecture and the same battery bay footprint, which is why one cell covers the full range. The BMS on each unit uses the same voltage thresholds and connector pinout, so no firmware or hardware adjustment is needed on swap.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a MDPNA-series unit. The BMS accepted the cell without fault codes, charge terminated cleanly at 4.2V, and the protection circuit tripped correctly at the low-voltage cutoff before cell damage could occur.
• Cold-start GPS behaviour after fitting: After fitting this cell, power the unit fully on outdoors before use. Removing all power clears the GPS receiver's ephemeris data, triggering a cold start. Allow 5–10 minutes in open sky to re-acquire a full satellite fix — subsequent warm starts will lock in under a minute.

GPS accuracy reduced when battery charge is low

Some GPS units in this class reduce receiver sensitivity as battery voltage drops, typically below 3.5V at the cell terminals. This is a firmware-level power-saving measure, not a fault with the receiver itself. The result is weaker satellite signal tracking, longer re-acquisition after tunnels, and occasional position drift. Keeping the cell above 3.6V during active navigation avoids this behaviour — charge before a long route if the indicator shows below half.

MDPNA shuts off without any low-battery warning

The on-screen battery indicator on these units reads from a voltage lookup table calibrated to the original cell's discharge curve. After significant degradation — or with a freshly fitted cell the unit hasn't profiled yet — the indicator can show one bar of charge while the actual cell voltage is already near the 3.4V cutoff threshold. The BMS then trips the protection circuit and the unit shuts off with no visible warning. Run two or three full charge cycles after fitting this replacement so the unit's voltage-to-capacity mapping re-aligns with the new cell.