Palm Treo 600 Replacement Battery 3.7V 2400mAh CA4TREO600

Palm Treo 600 / Treo 610 — 3.7V Li-ion Replacement Battery (CA4TREO600)

This 3.7V Li-ion cell replaces the original battery in the Palm Treo 600 and Treo 610 smartphones. Capacity is 2400mAh (8.88Wh). It fits the same battery bay and connector as the factory cell, restoring power to devices whose original cells have degraded past useful capacity.

• Treo 600 and 610 platform fit: Both models share the same battery bay dimensions, connector pinout, and charging IC. One cell covers both. No adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Treo 600 platform. The BMS held charge termination correctly and the protection circuit tripped cleanly on a simulated short at the connector.
• Fuel gauge recalibration on first cycle: After fitting a new cell, run the Treo down to automatic shutdown once before recharging. The Treo 600's fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle writes a new baseline and stops erratic percentage readings.

Why the Treo 600 reports wrong battery percentage after a cell swap

The Treo 600 uses a coulomb-counting fuel gauge IC that builds its percentage model from repeated charge and discharge cycles on the original cell. Swap the cell and the stored discharge curve no longer matches the new cell's actual voltage-to-capacity relationship. The gauge reads relative to a curve that doesn't exist anymore. One complete discharge-to-shutdown followed by a full charge resets the reference point and brings percentage reporting back in line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the GSM radio fires a high-current burst — typically during a call handoff or data sync — and voltage sags below the BMS cutoff threshold before the displayed percentage suggests it should. The fuel gauge still shows 20–30% but the cell voltage has already dropped under load to around 3.2V, triggering protection. Run two or three full discharge-charge cycles to let the gauge recalibrate the voltage cliff on the new cell. If shutdowns persist past three cycles, check the battery contacts on the device for corrosion causing added resistance.