Palm Tungsten TX Replacement Battery 3.7V 1150mAh Li-Polymer

Palm Tungsten TX — 3.7V Li-Polymer Replacement Battery

This 3.7V, 1150mAh Li-Polymer cell replaces the original battery in the Palm Tungsten TX PDA. The Tungsten TX is a touchscreen handheld released in 2003, running Palm OS with built-in Wi-Fi and Bluetooth. Capacity and voltage match the original spec exactly — no firmware prompts, no charge-indicator errors.

• Tungsten TX platform fit: The TX uses a slim Li-Polymer pack with a three-pin connector carrying the thermistor signal back to the charging circuit. This cell matches that connector pinout and cell geometry — 61.35 × 34.75 × 4.00mm — so the BMS handshake completes normally and the charge LED behaves as expected.
• Bench tested on actual hardware: We cycled this cell in a Tungsten TX unit, monitoring BMS cutoff at both ends. The protection circuit tripped cleanly at low voltage and accepted a full charge without flag errors on the charge controller.
• Sync before you swap: The Tungsten TX holds open application state and unsaved data in volatile RAM powered directly by the main battery. Removing the cell without first performing a HotSync to the host machine will wipe anything not written to flash storage. Run HotSync, confirm the sync log, then swap.

Why the Tungsten TX loses all data when the battery dies completely

Palm OS on the TX stores the active database, installed applications, and user preferences in SRAM. That SRAM is volatile — it needs continuous battery voltage to retain its contents. When the cell drops below the BMS cutoff threshold, power to SRAM is interrupted and everything in RAM is erased. Flash storage survives, but anything saved only to RAM does not. The fix is to keep the battery above critical voltage and sync frequently so the last good state is always on the host machine.

Tungsten TX won't boot after new battery installed

A freshly installed Li-Polymer cell may ship at storage charge — around 3.6–3.7V — which is enough to power the device but sometimes below the threshold the TX bootloader requires to complete a full cold-start sequence. If the screen stays dark or shows only a Palm logo loop, connect the TX to its charger and let it charge for at least 30 minutes before attempting to power on. Once the cell reaches approximately 3.9V, the bootloader completes normally and the device reaches the Palm OS home screen.