Lenovo Vibe P1 BL244 Replacement Battery 3.8V 4900mAh

Lenovo Vibe P1 / P1 Turbo — 3.8V Li-Polymer Replacement Battery (BL244)

This is a 3.8V, 4900mAh Li-Polymer replacement cell for the Lenovo Vibe P1, P1 Turbo, P1c58, and P1c72 smartphones. It uses OEM part number BL244 and drops into the same battery bay as the original. If your Vibe P1 shuts down unexpectedly or holds less charge than it used to, this cell replaces the degraded original.

• P1 / P1 Turbo compatibility: All four Vibe P1 variants — P1, P1 Turbo, P1c58, and P1c72 — share the same 3.8V BL244 cell footprint and connector pinout. The BMS handshake protocol and NTC thermistor line are identical across the range, so one cell covers all four models without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Vibe P1 platform. The BMS accepted the cell, passed the thermistor check, and allowed normal charge progression without triggering a safety cutoff at full load.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. The Vibe P1 fuel gauge IC was calibrated to your old cell's discharge curve — this single cycle lets it map the new cell's actual voltage slope before high-current charging applies.

Sudden shutdown at 20–30% on the Vibe P1 after a cell swap

This is the most common complaint after fitting a replacement cell. The Vibe P1's SoC pulls hard during LTE transmission bursts and screen-on peaks, and a new cell with an uncalibrated fuel gauge can report 25% remaining while the actual cell voltage is already near the BMS cutoff floor. When the modem fires, the instantaneous current draw causes a brief voltage sag that crosses the 3.0V per cell cutoff, and the BMS trips the output. The fix is one complete discharge-to-shutdown and full recharge cycle without fast charging — after that, the coulomb counter resets its baseline to the new cell and the shutdowns stop.

USB fast charge not working on the first cycle after fitting BL244

On the first cycle with a new BL244 cell, the Vibe P1 charge IC may refuse to enter fast charge mode and fall back to standard 5V/1A. This happens because the charge controller checks the cell's internal impedance on the first handshake — a new, fully unformed cell reads higher impedance than the threshold the IC expects for fast charge qualification. Run one standard-rate full charge first. Internal impedance drops as the cell forms, and the fast charge handshake completes normally on the second cycle, typically resuming at the expected input voltage.