Huawei Y300 HB5V1 Replacement Battery 3.8V 1750mAh

Huawei Y300 / Y300C / U8833 — 3.8V Li-ion Replacement Battery (HB5V1 / HB5V1HV)

This is a 3.8V, 1750mAh Li-ion replacement battery for the Huawei Y300, Y300C, U8833, Y500, and 23 additional compatible models. It slots into the same bay as the original HB5V1 or HB5V1HV cell and connects to the same charge IC and fuel gauge circuit. Dimensions are 58.30 × 51.00 × 5.15mm — verify your bay before installing.

• Y300 / Y300C / U8833 / Y500 series fitment: These models share the same voltage rail, physical connector, and BMS handshake protocol, which is why a single cell covers the full group. The HB5V1HV variant adds a slightly elevated charge ceiling — this replacement handles both charge profiles without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on Y300 hardware, monitoring BMS cutoff at both the low-voltage floor and the charge termination point. The protection circuit tripped correctly at each threshold with no false shutdowns during load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Y300 after a cell swap

This is a voltage cliff issue, not a capacity fault. When the modem fires up for a call or the screen peaks in brightness, current draw spikes and the new cell's voltage drops faster than the old calibration table predicts. The fuel gauge IC still thinks it has headroom, but the BMS protection circuit sees a hard undervoltage and cuts power. One full discharge-charge cycle after installation resets the coulomb counter and closes the gap between reported and actual state of charge — after that cycle, target 3.7V at shutdown to confirm the gauge is tracking correctly.

OS reporting wrong battery percentage after replacement

The fuel gauge IC on the Y300 retains the discharge curve of the previous cell in its calibration register. When a new cell goes in, the IC maps incoming voltage readings against that old curve, so percentage readouts can jump, stall, or land nowhere near actual charge state. The fix is a single uninterrupted full discharge — run the phone until it powers off automatically — then charge to 100% without interruption. After that cycle, the coulomb counter resets to the new cell's actual capacity and percentage tracking stabilises.