About this replacement
Philips Xenium S327 / CTS327 — 3.8V Li-Polymer Replacement Battery (AB3000KWMT)
This 3.8V, 2800mAh lithium-polymer cell replaces the AB3000KWMT battery in the Philips Xenium S327 and CTS327 smartphones. The original cell degrades with charge cycles, causing capacity fade and unexpected shutdowns. This replacement restores the phone to factory power specs.
- Xenium S327 and CTS327 compatibility: Both models share the same battery bay dimensions, 3.8V nominal voltage rail, and AB3000KWMT part number. The connector pinout and BMS handshake are identical across both variants, so one cell covers either device.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the S327 platform. The BMS negotiated the charge protocol correctly, protection cutoffs triggered at the expected voltage thresholds, and the fuel gauge IC accepted the cell without flagging errors.
- Fuel gauge recalibration after install: On first use after installation, disable fast charging and let the phone complete one full discharge-to-charge cycle at standard current. This gives the fuel gauge IC a clean discharge curve from the new cell before high-current charging begins on an uncalibrated cell.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff issue, not a capacity problem. Under modem transmission or screen peak loads, the new cell's voltage drops sharply at around 3.5V, dipping below the threshold the fuel gauge IC expects for 20–30% remaining. The phone interprets this as a dangerously low state and forces a shutdown to protect the cell. One full calibration cycle — discharge to 1–2% without interruption, then charge uninterrupted to 100% — resets the coulomb counter and pulls this cutoff point back to its correct voltage.
USB-PD or fast charge not accepted on the first cycle after swap
Some Xenium S327 units will only negotiate fast charge once the charge IC has seen a baseline charge session on the new cell. On the first cycle, the IC defaults to standard 5V/1A input while it validates the new BMS. This is not a fault with the replacement cell. Connect the phone to the original charger, complete one standard charge to 100%, disconnect, then reconnect — fast charge negotiation typically resumes from the second cycle onward.