About this replacement
Palm i705 / Tungsten W — 3.7V Li-Polymer Replacement Battery (169-2492)
This 3.7V, 1700mAh Li-Polymer cell replaces the original battery in the Palm i705, Tungsten C, and Tungsten W handhelds. All three models share the same voltage rail and connector footprint, confirmed against OEM part numbers 169-2492, 1694399, LIS2106, PA1429, and LIS2132. Dimensions are 69.28 × 62.55 × 3.55mm — a direct physical match to the factory cell.
- i705, Tungsten C, and Tungsten W compatibility: These three Palm devices share the same 3.7V battery bay, connector pinout, and BMS handshake logic. One cell covers all three platforms without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Palm i705 unit. The BMS accepted charge from the cradle charger immediately, balanced correctly through the full cycle, and tripped protection cleanly at low voltage without corrupting the OS.
- Sync before you swap: Palm PDAs hold open application data and calendar state in SRAM powered directly by the main battery. Pull the battery before syncing and that data is gone. HotSync to the host computer first — every time — before removing the old cell.
Why the Palm i705 loses all data after a battery swap
The i705 stores active application data, contacts, and calendar entries in volatile SRAM, not flash. That RAM needs continuous voltage to retain its contents. The moment the battery is removed and voltage drops below roughly 2.8V, every byte in SRAM is gone. A backup battery or supercap is not present in this design to bridge the gap. Always HotSync to the desktop before opening the battery compartment.
Palm Tungsten W not booting after new battery installation
A freshly shipped Li-Polymer cell often sits at storage voltage — around 3.6V — which is below the minimum the Tungsten W boot sequence needs to complete. The device powers on briefly, shows the Palm logo, then shuts down. This is the BMS protecting the system from a low-voltage brown-out during boot, not a faulty battery. Place the unit in its cradle charger for at least 30 minutes before attempting to power on, then hold the power button until the boot screen holds at 3.7V or above.