Land Rover S1 3.7V Replacement Battery 1750mAh Li-ion

Land Rover S1 / S2 / S9 — 3.7V Li-ion Replacement Battery

This 3.7V, 1750mAh Li-ion cell replaces the original battery in the Land Rover S1, S2, and S9 rugged smartphones. It fits the same battery bay and connector as the factory cell. Use the capacity figure from this listing — 1750mAh — as your reference spec.

• S1, S2, and S9 compatibility: All three models share the same battery bay dimensions (52 × 36 × 10.30mm), voltage rail, and connector pinout. The BMS handshake protocol is consistent across this series, so one cell covers all three variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the S-series platform. The BMS accepted the cell without triggering a rejection flag, and the charge IC reached full termination voltage at 4.2V as expected.
• Fuel gauge recalibration after install: On first use, disable fast charging if your device supports it, then run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Land Rover S-series after a cell swap

This is a voltage cliff issue, not a capacity problem. Under peak modem transmission or screen load, a new cell that hasn't been calibrated yet can sag below the cutoff threshold before the displayed percentage reaches zero. The phone shuts down to protect the cell even though the gauge still shows charge remaining. One full discharge-charge cycle lets the fuel gauge IC update its internal map and removes the mismatch between reported and actual cell voltage.

Phone won't power on after sitting in storage with a flat battery

If the cell dropped below approximately 2.5V during storage, the BMS enters lockout mode to prevent charging a critically discharged lithium cell. The phone will show no response — no charge indicator, no boot screen. Connect the phone to a low-output USB charger (5V/500mA wall adapter, not a fast charger) and leave it for 20–30 minutes before attempting to power on. Once the BMS detects the cell is above the recovery threshold, normal charging resumes.