Philips A20VDP/3ZP Xenium X503 Compatible Battery 3.7V 1000mAh

Philips Xenium X503 / X703 / K700 — 3.7V Li-ion Replacement Battery (A20VDP/3ZP)

This is a 3.7V, 1000mAh Li-ion cell for the Philips Xenium X503, X703, K700, and K600 series mobile phones. It replaces OEM part numbers A20VDP/3ZP and AB1000AWML. Install it when the original cell can no longer hold a charge or causes erratic shutdowns.

• Xenium X503 / X703 / K700 / K600 compatibility: These Xenium models share the same battery bay dimensions (57 × 39 × 4.2mm), 3.7V nominal rail, and connector pinout — one cell covers all of them without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the X503 platform. The BMS accepted the charge handshake on the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold with no anomalies.
• Fuel gauge recalibration after swap: On first use after installation, run one full discharge-to-charge cycle with fast charging disabled. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before any high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Xenium X503

This is a voltage cliff, not a capacity problem. At around 3.6–3.7V, an aged or cold cell can no longer sustain voltage under the combined load of the modem radio and display backlight. The phone's protection circuit cuts power before the OS can warn you. A new cell with a lower internal resistance holds voltage under peak load, which eliminates the cliff. If the shutdown continues after a replacement, the fuel gauge IC is still calibrated to the old cell — run one full discharge cycle to reset it.

Phone warm near the battery compartment on the first charge

A new Li-ion cell ships with slightly higher internal impedance than a broken-in cell. On the first charge cycle, the charge IC delivers current into that higher impedance, which generates more heat than you'd expect. This is normal and settles after one or two full cycles as the cell's internal resistance drops. If the phone stays hot beyond the second cycle, check that the battery contacts are seated flush — a misaligned contact forces the charge IC to compensate, which sustains elevated temperatures. Target a skin temperature below 40°C at the battery cover after the second cycle.