Dopod 565 Replacement Battery BTR5600B 3.7V 2200mAh

Dopod 565 / 575 / 577W / 585 Series — 3.7V Li-ion Replacement Battery (BTR5600B)

This is a 3.7V, 2200mAh Li-ion replacement battery for the Dopod 565, 575, 577W, and 585 Windows Mobile smartphones. It carries OEM part numbers BTR5600B, ST26A, and ST26B. If the original cell has degraded to the point where the phone won't hold a usable charge, this cell restores the device to working condition.

• 565 / 575 / 577W / 585 compatibility: These four Dopod models share the same 3.7V single-cell Li-ion architecture, battery connector, and cavity dimensions. The BMS handshake expectation is identical across the group, so one cell fits all four without modification.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle and confirmed the BMS communicates charge state correctly to the device. Charge acceptance was clean from insertion with no negotiation errors reported.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before normal use. The fuel gauge IC on these Windows Mobile devices calibrates against the cell's discharge curve — skipping this step leaves the coulomb counter anchored to the old cell's profile.

Sudden shutdown at 20–30% on the Dopod 565

This is one of the most reported issues after a cell swap on these devices. The fuel gauge IC still holds calibration data from the worn original cell, so the percentage shown on screen doesn't reflect the new cell's actual voltage curve. Under modem or display load, the phone pulls current the gauge didn't predict, the cell voltage drops below the BMS cutoff threshold, and the device shuts off without warning. One full discharge-to-shutdown followed by a full uninterrupted charge cycle resets the coulomb counter to the new cell's actual capacity. After that cycle, reported percentage and real charge state align.

Device won't power on after sitting in storage — BMS lockout

A Dopod 565 that has been shelved for months with the battery installed often won't power on because the cell has self-discharged below the BMS protection threshold — typically under 2.5V per cell. The BMS locks output to prevent damage to a deeply discharged Li-ion cell. Connect the device to a charger and leave it for at least 30–60 minutes without attempting to power it on — most charger ICs on these phones will trickle current into a locked-out cell to bring it back above the 2.5V recovery threshold before the BMS re-engages. If the charging LED does not illuminate within five minutes, try a different USB cable or wall adapter before assuming the battery is at fault.