TEASI One 2 GPS Navigator Compatible Battery 3.7V 2500mAh

TEASI One 2 — 3.7V Li-Polymer Replacement Battery (PL784262)

This 3.7V, 2500mAh Li-Polymer cell replaces the original PL784262 battery in the TEASI One 2 handheld GPS navigator. The One 2 is a compact outdoor navigation unit used for hiking, trail navigation, and geocaching. Voltage, capacity, and connector position match the original specification.

• TEASI One 2 fit: The One 2 uses a flat Li-Polymer pouch cell at 3.7V nominal. This replacement matches the original cell's footprint at 60.10 × 42.30 × 7.04mm, so the battery seats correctly without clearance issues against the GPS module or display ribbon.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held charge termination correctly at 4.2V and the low-voltage cutoff triggered cleanly before the cell dropped below safe operating range — no false shutoffs during the discharge curve.
• Cold-start initialisation after fitting: After fitting this cell and powering the One 2 on outdoors, allow the unit to acquire a satellite fix before use. The GPS performs a full cold start after any power interruption, which takes 5–10 minutes for first fix. Subsequent warm starts resolve in under a minute.

GPS accuracy reduced at low battery on the TEASI One 2

Some GPS receivers throttle RF sensitivity when cell voltage drops below a threshold — typically around 3.5V on Li-Polymer cells. The One 2 may show wider position scatter or slower track updates before the low-battery icon appears. This is not a satellite problem; it is the receiver pulling less power from a weakening cell. Replacing the cell restores full receiver sensitivity.

TEASI One 2 shutting off without visual battery warning

The battery indicator on the One 2 is calibrated against the original cell's discharge curve. After extended use, an aged cell voltage sags faster than the indicator tracks, so the unit hits the BMS cutoff threshold before the on-screen warning has time to trigger. This replacement cell restores the correct discharge curve, so the indicator and actual capacity realign. If unexpected shutoffs persist after fitting, perform a full charge to 4.2V and run one complete discharge cycle to let the indicator recalibrate.