Huawei Ascend G730 Replacement Battery HB4742A0RBW 3.8V 2300mAh

Huawei Ascend G730 / Honor 3C — 3.8V Li-ion Replacement Battery (HB4742A0RBW)

This is a 3.8V, 2300mAh Li-ion cell built to OEM part numbers HB4742A0RBW and HB4742A0RBC. It fits the Huawei Ascend G730, Honor 3C, H30-T00, and H30-T10, among other models in this family. The battery slots into the same compartment as the original and connects to the same charge IC and fuel gauge circuit.

• Shared platform — G730 and Honor 3C family: These models run the same power rail layout and use an identical connector pinout, which is why Huawei issued one part number across the range. The BMS handshake and thermistor line are wired identically, so the phone's charge IC accepts this cell without firmware conflict.
• Bench tested on actual hardware: We cycled this cell through the Huawei charge IC at both trickle and standard charge rates. The BMS held the 4.35V upper cutoff correctly and triggered low-voltage protection at 3.0V without dropping the connection mid-cycle.
• Fuel gauge recalibration on first use: On the first cycle after installation, run the phone from 100% down to automatic shutdown without charging mid-way. This gives the coulomb counter a full discharge curve to calibrate against the new cell — skipping this step is the main reason percentage readings jump or stall after a swap.

Sudden shutdown at 20–30% on the G730 after a cell swap

The Ascend G730's fuel gauge IC inherits the discharge curve from the previous cell. When a new cell goes in, the stored curve no longer matches actual cell voltage under load. The modem radio and display together draw enough current to cause a voltage sag that the IC misreads as a deeper state of discharge than the percentage shows. The phone cuts out because the IC thinks it has hit the floor when it hasn't. One full discharge-charge cycle resets the coulomb counter and eliminates the premature shutdown.

USB charging not accepted on the first attempt after replacement

A new cell fresh from storage often sits near 3.6V — low enough that the Huawei charge IC enters trickle mode and the phone stays dark for several minutes before showing any charge indicator. This is not a fault with the battery or the cable. Leave the phone connected for at least 15 minutes before pressing the power button. Once the cell climbs above 3.7V, the IC exits trickle mode and the phone powers on normally.