Transonic PNA-3002 Replacement Battery 3.7V 1400mAh

Transonic PNA-3002 / MD 95255 — 3.7V Li-ion Replacement Battery (E3MT07135211)

This 3.7V 1400mAh Li-ion cell replaces part number E3MT07135211 in the Transonic PNA-3002 and MD 95255 portable GPS navigators. It restores power to units where the original cell has degraded and can no longer hold a charge through a full navigation session. Capacity is 1400mAh (5.18Wh), matching the original cell specification.

• PNA-3002 and MD 95255 compatibility: Both units share the same battery bay dimensions and connector pinout, and both run off the same 3.7V power rail feeding the GPS receiver and display backlight — the E3MT07135211 cell fits either unit without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible hardware and confirmed the protection circuit trips correctly at low-voltage cutoff, preventing the deep-discharge damage that typically shortens GPS navigation batteries.
• Cold-start acquisition after fitting: After fitting this cell, power the GPS on outdoors and let it acquire a full satellite fix before driving. GPS units perform a cold start after any complete power interruption — first fix can take 5 to 10 minutes outdoors versus under a minute for a warm start once the almanac is cached.

GPS accuracy reduced at low battery on the PNA-3002

The PNA-3002 receiver circuit draws more current during active satellite tracking than during standby map display. When the cell voltage drops below roughly 3.5V, some GPS units reduce RF receiver sensitivity to protect remaining charge — this shows up as position drift or a weaker satellite count on screen. Replacing a degraded cell that sags under load restores the receiver to full sensitivity. Charge the new cell to 4.2V before a long navigation run to keep the voltage rail stable throughout.

PNA-3002 shutting off without low-battery warning

An aged cell loses voltage rapidly in the final 10 to 15 percent of capacity, dropping steeply enough that the device hits its hardware cutoff threshold before the on-screen battery indicator catches up. The result is an abrupt shutdown with no warning displayed. This is a calibration gap between the fuel gauge and the cell's actual discharge curve — not a device fault. Fitting a fresh cell and running two full charge-discharge cycles lets the device relearn the voltage curve and restore accurate low-battery warnings.