HBU570 Huawei U1300 Replacement Battery 3.7V 750mAh

Huawei U1300 / U3300 Series — 3.7V Li-ion Replacement Battery (HBU570)

This is a 3.7V, 750mAh Li-ion replacement battery for the Huawei U1300, U1310, U3300, and U3310. It replaces OEM part numbers HBU570 and HBL4AHU. Install it when the original cell no longer holds voltage under call or screen load.

• U1300 and U3300 platform fit: These four models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the full range. The 50.13 × 35.81 × 15.33mm form factor seats flush without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the U1300 platform. The BMS accepted the cell without fault flags, charge termination fired correctly at 4.2V, and the protection circuit triggered cleanly at the low-voltage cutoff.
• First-cycle fuel gauge reset: After fitting this cell, run one full discharge down to auto-shutdown, then charge uninterrupted to 100% before normal use. The U1300's fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step causes the OS to misread state of charge from the first charge onward.

Sudden shutdown at 20–30% on the U1300 after a cell swap

The U1300's fuel gauge IC stores a learned discharge curve from the previous cell. A new cell with different internal impedance hits a voltage cliff under modem transmit load before the gauge reaches 0%. The phone reads 25% but the cell voltage drops below the BMS cutoff threshold — typically 3.0V under load — and the device shuts off. One complete discharge-charge cycle lets the coulomb counter relearn the new cell's actual low-voltage behaviour and eliminates the premature cutoff.

Battery percentage jumping erratically in the first few days after replacement

This is the fuel gauge IC recalibrating against a cell it has never measured. The U1300 uses a coulomb counter that accumulates error when its reference curve does not match the installed cell. Percentage can jump 10–15 points in either direction until the IC completes at least one full discharge-charge cycle with the new cell. Run the phone from 100% down to auto-shutdown, then charge straight to 100% without interruption — after that cycle, the percentage readout stabilises.