Huawei U8150 Replacement Battery HB4J1 3.7V 1100mAh

Huawei U8150 / IDEOS / C8500 — 3.7V Li-ion Replacement Battery (HB4J1)

This is a 3.7V, 1100mAh Li-ion cell built to fit the Huawei U8150 and its platform siblings, including the IDEOS, C8500, and V845. It replaces part numbers HB4J1 and HB4J1H directly. If your original battery no longer holds a charge through a normal day or causes unexpected shutdowns, this cell restores capacity to factory spec.

• U8150 platform fit: The U8150, IDEOS, C8500, and V845 share the same battery bay dimensions (54 × 43 × 5mm), connector pinout, and BMS communication protocol — which is why one cell covers all of them. Swapping to a physically incompatible cell here risks connector damage and BMS handshake failure.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge runs on the U8150 platform, monitoring BMS handshake, charge termination voltage, and thermal behaviour. The cell accepted charge without cutoff errors and terminated cleanly at the expected ceiling voltage.
• Fuel gauge recalibration after install: After fitting this cell, run one full discharge down to automatic shutdown — do not interrupt it — then charge uninterrupted to 100%. This gives the fuel gauge IC one complete cycle to map the new cell's discharge curve before it starts reporting accurate percentages.

Why the U8150 reports wrong battery percentage after a cell swap

The U8150 uses a fuel gauge IC that builds its percentage model from the previous cell's discharge curve. When you install a fresh cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The result is erratic readings — the phone may show 60% and shut down moments later. One complete uninterrupted discharge-charge cycle forces the IC to relearn the curve against the new cell and restores accurate reporting.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display pulls a current spike the cell cannot sustain at low state-of-charge — voltage drops below the BMS protection floor and the phone cuts out before the gauge reaches zero. It is not a faulty cell; it is the fuel gauge IC still using the old cell's calibration. Run the recalibration cycle described above. If shutdowns continue past two full cycles, check that the cell contacts are clean and seated flat — a high-contact-resistance connection amplifies voltage sag under load, dropping the cell below the 3.0V BMS cutoff prematurely.