Lenovo BL256 Vibe X3 Lite Compatible Battery 3.8V 3200mAh

Lenovo Vibe X3 Lite — 3.8V Li-Polymer Replacement Battery (BL256)

This is a 3.8V, 3200mAh lithium-polymer replacement battery for the Lenovo Vibe X3 Lite smartphone. It uses OEM part number BL256 and fits several Lenovo variants including the K51c78, PB1-750N, and Lemon X3 Lite. Swap this cell when the original no longer holds enough charge to get through a full day.

• Vibe X3 Lite variant compatibility: The K51c78, PB1-750N, and Lemon X3 Lite share the same battery bay dimensions, connector pinout, and BL256 BMS handshake — so one cell covers all of them without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Vibe X3 Lite mainboard. The BMS negotiated correctly with the charge IC, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff problem, not a capacity problem. The Vibe X3 Lite's modem and display draw bursts of current that pull cell voltage below the BMS cutoff threshold — even when the fuel gauge still reads 20–30%. A new cell has a steeper discharge curve than the aged cell the fuel gauge IC was calibrated to, so the mismatch is worse on first install. Run one full discharge cycle down to automatic shutdown, then charge to 100% uninterrupted. After that single cycle, the coulomb counter resets its reference and the shutdowns typically stop.

Phone reports wrong battery percentage after a cell swap

The fuel gauge IC on the Vibe X3 Lite stores a learned discharge curve from the original cell. When you install a new cell, the IC still references that old curve, so the percentage shown is inaccurate — often jumping several points or freezing near full. The fix is a forced recalibration: drain the phone fully until it shuts off on its own, then charge it to 100% in one unbroken session with the screen off. After this cycle, the IC maps its coulomb counter to the new cell's actual voltage range and percentage readings stabilise.