Lenovo MA308 Replacement Battery BL199 3.7V 1000mAh

Lenovo MA308 / MA309 — 3.7V Li-ion Replacement Battery (BL199)

This is a 3.7V, 1000mAh Li-ion cell replacing part number BL199 in the Lenovo MA308 and MA309 smartphones. Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol, so one cell covers both. Dimensions are 63.52 × 41.91 × 3.93mm — measure your existing cell before ordering if you are unsure of your exact variant.

• MA308 and MA309 compatibility: These two models use the same voltage rail, identical physical connector, and the same BMS handshake sequence. A single BL199 cell works in both without modification.
• Bench tested on actual hardware: We cycled BL199 cells through full charge and discharge on a controlled bench rig. The BMS accepted charge current correctly, hit cutoff at the expected upper voltage, and logged no fault events during the test sequence.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC build an accurate discharge curve against the new cell before any high-current protocol is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the MA308 after a cell swap

The MA308 fuel gauge IC retains the discharge curve from the original cell after a swap. When the new cell's actual resting voltage drops below what the old curve predicts at 20–30%, the phone interprets this as a critical low-battery event and forces shutdown — even though charge remains in the cell. This is not a faulty battery. One full discharge-charge cycle on standard current overwrites the stored curve and realigns the percentage readout to the new cell's actual behaviour.

Phone feels warm near the battery during the first two charges

A new high-impedance cell has slightly higher internal resistance than a settled cell. The charge IC compensates by pushing current harder in the early CC phase, which generates more heat than usual. This typically normalises within two to three full charge cycles as the cell's impedance settles. If the case stays warm past the third cycle, check that nothing is blocking airflow around the back panel and confirm charge current is not set above the standard rate for this device.