Huawei U8150 HB4J1 Replacement Battery 3.7V 1300mAh

Huawei U8150 / IDEOS — 3.7V Li-ion Replacement Battery (HB4J1)

This is a 3.7V, 1300mAh Li-ion cell replacing the OEM HB4J1 / HB4J1H battery in the Huawei U8150. It fits the IDEOS, C8500, and V845 lines, plus fourteen additional Huawei variants that share the same connector and BMS handshake. Capacity figures come from product data — 4.81Wh total.

• U8150 / IDEOS platform fit: These models share a common 3.7V single-cell architecture, a standardised connector pinout, and compatible BMS communication — so one cell covers the full range without any wiring modifications.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the U8150 platform. The BMS accepted charge on the first connection, and the protection circuit tripped correctly at low-voltage cutoff without locking out the device.
• Fuel gauge recalibration on first use: On the first cycle after installation, run the phone down to automatic shutdown, then charge uninterrupted to 100% before using it normally. This gives the fuel gauge IC a full reference curve against the new cell — skipping it causes percentage jumps for the first several cycles.

Why the U8150 reports wrong battery percentage after a cell swap

The U8150 uses a coulomb-counter fuel gauge IC that builds its state-of-charge model against the original cell's discharge curve. When you swap in a new cell, that stored curve no longer matches reality. The IC may report 40% when the cell is near empty, or show 100% before the charge cycle finishes. One complete discharge-to-shutdown followed by an uninterrupted full charge forces the IC to rebuild its reference curve against the replacement cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem transmits or the screen backlight peaks — both events pull a short burst of high current that drops cell voltage below the BMS cutoff threshold, even though the fuel gauge still shows charge remaining. It is a calibration gap, not a faulty cell. The fix is the same full recalibration cycle: discharge to automatic shutdown, charge to 100% without interruption. After one clean cycle, the IC maps the voltage cliff correctly and stops triggering early shutdowns.