Spetrotec 4642-E434-V12 Compatible Battery 3.7V 1100mAh

Spetrotec 4642-E434-V12 SEG/N — 3.7V Li-Polymer Replacement Battery (AE6036501S1P)

This 3.7V, 1100mAh lithium-polymer cell replaces part number AE6036501S1P in the Spetrotec 4642-E434-V12 SEG/N portable GPS navigator. It restores power to the navigation unit when the original cell no longer holds a usable charge. Dimensions are 52.00 × 33.80 × 6.00mm — confirm these against your existing cell before fitting.

• 4642-E434-V12 SEG/N fitment: This cell matches the voltage rail and physical footprint of the original AE6036501S1P. The connector orientation and BMS logic align with what the navigator's charge management circuit expects — no modification needed to fit the battery tray.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under the navigator's load profile. The BMS held cutoff at the correct low-voltage threshold and accepted a full charge without triggering protection mode at any point in testing.
• First-use satellite acquisition: After fitting this cell, power the unit on outdoors before your first trip. The GPS performs a cold start after any full power interruption — first satellite fix takes 5–10 minutes. Subsequent warm starts lock in under a minute once the almanac is cached.

GPS accuracy dropping at low battery on the 4642-E434-V12 SEG/N

Some GPS navigators reduce receiver sensitivity when battery voltage falls below a set threshold — the unit prioritises keeping the display and processor running. On the 4642-E434-V12 SEG/N, this can appear as position drift or slower route recalculation before any low-battery indicator appears. A degraded original cell hits this voltage floor much earlier in a session than a fresh cell will. Replacing the cell restores full receiver power across the entire charge cycle.

Navigator shuts off without warning before the battery indicator reaches empty

This happens when the battery indicator is calibrated against the original cell's discharge curve — an aged or different-capacity cell drops voltage more steeply under load than the calibration expects. The unit's voltage-threshold cutoff trips before the visual gauge reaches the low-battery icon. After fitting this replacement, run two full charge-to-cutoff cycles to allow the navigator to re-align its gauge to the new cell's discharge curve. If the issue persists, check that the unit is running the latest firmware, as some revisions include updated battery calibration tables.