Philips Xenium T3566 Replacement Battery AB2000HWMC 3.7V

Philips Xenium T3566 / W3568 — 3.7V Li-ion Replacement Battery (AB2000HWMC)

This is a 3.7V, 2000mAh Li-ion replacement battery for the Philips Xenium T3566, CTW3568, W3568, and Xenium W3568. OEM part number AB2000HWMC. It slots into the same bay as the original cell and connects to the same three-pin thermal contact on the board.

• T3566 and W3568 platform fit: Both the T3566 and W3568 share the same battery bay dimensions (75.66 × 49.10 × 5.00mm), identical connector pinout, and the same BMS handshake protocol — so one cell covers all four listed model variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the W3568 platform. The BMS accepted the new cell without triggering a lockout, charge current ramped normally through CC/CV phases, and the thermal pin reported correctly throughout.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Xenium T3566

This is the most reported symptom after a cell ages past 18 months. The fuel gauge IC still reads 25% state-of-charge, but the cell's internal resistance has risen enough that modem transmit bursts or display brightness spikes pull the terminal voltage below the BMS cutoff threshold instantly. The phone shuts off not because charge is gone, but because the cell cannot sustain voltage under load. A new cell at 2000mAh with lower internal resistance removes that voltage cliff — the gauge and the actual cutoff align again.

Phone reports wrong percentage after fitting the AB2000HWMC

The fuel gauge IC on the T3566 stores a learned discharge curve for the old cell. When a new cell goes in, that stored curve no longer matches real cell behaviour — so the percentage reading drifts or jumps. Run one complete discharge from 100% down to auto-shutoff, then charge uninterrupted to 100% with fast charging off. After that single cycle the coulomb counter resets its reference points against the new cell and percentage readings stabilise to within a few percent of actual charge state.