Huawei Y300 HB5V1 Compatible Battery 3.7V 1500mAh

Huawei Y300 / Y500 Series — 3.7V Li-ion Replacement Battery (HB5V1)

This is a 3.7V, 1500mAh Li-ion cell for the Huawei Y300, Y300C, U8833, Y500, and over 22 additional Huawei handsets that share the HB5V1 footprint. It slots into the same bay as the factory cell and connects to the same charge IC and fuel gauge circuit. Dimensions are 58.30 × 51.00 × 5.15mm — check these against your current cell before ordering.

• Y300 / Y500 platform compatibility: These models share the HB5V1 connector pinout and the same BMS voltage thresholds — 4.2V charge ceiling, 3.0V cutoff floor. The fuel gauge IC on all these devices reads the same discharge curve, so the cell swaps without firmware changes.
• Bench tested on actual hardware: We cycled this cell on a Y300 unit and confirmed the BMS accepted the new cell without triggering a protection lockout. The charge IC ramped to CC/CV correctly, and the fuel gauge registered a full state-of-charge at the end of the first cycle.
• Fuel gauge recalibration after install: On first use, disable any power-saving fast charge modes and run one complete discharge-charge cycle at standard current. The Y300's coulomb counter calibrates its learned capacity against the new cell's discharge curve during this cycle — skipping it causes the percentage display to drift off early.

Why the Y300 reports wrong battery percentage after a cell swap

The Y300 uses a coulomb counter that builds a learned discharge model over multiple cycles. When you replace the cell, that model still references the old cell's impedance curve. The gauge will report inaccurate percentages — often showing 15–20% higher than actual charge — until it runs at least one full discharge-charge cycle against the new cell. To reset it, drain the phone to automatic shutdown, then charge uninterrupted to 100% with the screen off. After that single cycle, the reported percentage tracks the actual cell voltage reliably.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a current spike that pulls cell voltage below the BMS cutoff threshold before the gauge registers a low-charge warning. A new cell with an uncalibrated gauge makes this worse — the phone thinks it has 25% remaining while actual voltage is already near 3.2V under load. Run the recalibration cycle described above first. If shutdowns continue after two full cycles, check that the battery connector is fully seated — a partial connection raises contact resistance and amplifies voltage sag under load.