Philips Xenium S337 Replacement Battery 3.7V 1800mAh

Philips Xenium S337 / CTS337 — 3.7V Li-ion Replacement Battery (AB2000JWML)

This is a 3.7V, 1800mAh Li-ion cell rated at 6.66Wh, built to the AB2000JWML specification. It fits the Philips Xenium S337 and CTS337 dual-SIM candybar phones. Install it when the original cell no longer holds adequate charge or the phone shuts down unexpectedly under normal use.

• S337 and CTS337 compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V single-cell architecture. The AB2000JWML part number covers both variants — no hardware differences affect fitment.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the S337 platform. The BMS accepted the cell without error codes, and charge termination triggered correctly at 4.2V.
• Fuel gauge recalibration on first cycle: After fitting this cell, disable any fast-charge mode and run one complete discharge-to-charge cycle before normal use. This gives the fuel gauge IC time to map its coulomb counter against the new cell's discharge curve before high-current charging pushes into an uncalibrated state.

Sudden shutdown at 20–30% on the Xenium S337

This happens when the cell voltage drops below the modem's minimum rail voltage under load — even though the fuel gauge still reads 20–30%. The S337's dual-SIM modem draws a short high-current spike during call setup or network switching. An aged cell with elevated internal resistance cannot sustain voltage through that spike, so the phone cuts out. A fresh AB2000JWML cell with lower impedance holds voltage through those transients. After fitting the new cell, run one full discharge cycle so the fuel gauge recalibrates — this stops the reported percentage from lagging the actual cell state.

Phone warm near the battery slot during first few charges

A new cell typically arrives with slightly higher internal impedance than a fully conditioned one. During the first one or two charge cycles, the charge IC works against that higher impedance, which generates mild heat near the battery bay. This is normal and settles after the cell beds in. If warmth persists beyond the third charge cycle or the phone feels hot to the touch, check that the replacement is seated flat and the connector is fully engaged — a partially connected cell forces the charge IC to compensate, raising heat output.