About this replacement
Philips X2560 / E310 — 3.7V Li-ion Replacement Battery (AB1630DWMX)
This is a 3.7V, 1600mAh Li-ion cell for the Philips X2560, X2566, E310, and Xenium X2560 series. It replaces the original battery when capacity has degraded to the point where the phone can no longer hold a usable charge through a normal day. OEM part numbers AB1630DWMX, AB1630CWML, and AB1630DWMC all apply to this cell.
- X2560 / E310 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers all listed variants without any hardware modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the X2560 platform. The BMS accepted the cell, charge current stepped down correctly at top-of-charge, and no protection trips occurred at low-voltage cutoff near 3.0V.
- Fuel gauge recalibration on first use: On first installation, disable fast charging if your carrier or ROM supports it. Run one complete discharge to auto-shutoff, then charge to 100% uninterrupted. This gives the fuel gauge IC a clean reference curve before high-current charging sessions begin.
Why the X2560 reports wrong battery percentage after a cell swap
The Philips X2560 uses a coulomb-counter-based fuel gauge IC that tracks charge and discharge current over time to estimate state of charge. When you swap in a new cell, the IC still holds the learned discharge curve from the old, degraded battery. That mismatch causes the reported percentage to run fast in the upper range and slow in the lower range. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the IC to rebuild its reference map against the new cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem or display fires a high-current draw spike and the cell voltage drops sharply below the BMS protection threshold — typically around 3.2–3.0V — even though the fuel gauge still reads 20–30%. The fuel gauge IC is still calibrated to the old cell's internal resistance profile, so it underestimates how steep the voltage cliff is under load. The fix is the same recalibration cycle: run the phone to automatic shutdown without forcing a restart, then charge straight to 100%. After one full cycle the IC adjusts its low-voltage prediction to match the new cell's actual discharge curve.