Huawei A199 Replacement Battery 3.8V 2100mAh HB505076RBC

Huawei Ascend G710 / A199 — 3.8V Li-ion Replacement Battery (HB505076RBC)

This is a 3.8V, 2100mAh Li-ion cell built to replace the original HB505076RBC battery in the Huawei Ascend G710 and A199. It also fits the G606, G610, and 24 additional Huawei models sharing the same battery bay and connector. Capacity figures come from the product data — 7.98Wh total energy.

• G710 / G606 / G610 platform fit: These models share the same 3.8V single-cell architecture, physical footprint, and flex connector pinout. One cell covers all of them without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on G710 hardware. The BMS accepted charge handshake without rejection, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no runaway events observed.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC inside the G710 is calibrated to the old cell's discharge curve. Skipping this step causes the percentage counter to read incorrectly for weeks.

Sudden shutdown at 20–30% on the Ascend G710 after a cell swap

This happens because the phone's fuel gauge IC still holds the discharge curve of the degraded original cell. When the new cell hits a voltage zone that maps to 20–30% on the old curve, the modem or display draws a current spike the gauge wasn't expecting, and the phone cuts power to protect the rail. It is not a fault in the replacement cell. One full discharge from 100% to auto-shutdown, followed by an uninterrupted charge to 100%, forces the coulomb counter to re-anchor its zero and full points against the new cell's actual curve.

Phone warm near the battery bay during the first few charges

A new high-impedance cell presents more internal resistance than a worn one during the first few cycles. The charge IC pushes current into that resistance, and some of it becomes heat. This is normal for the first two or three charge cycles and does not indicate a fault. If the phone feels hot to the touch — above what you'd call warm — check that the charger output does not exceed the spec on the battery label. After three cycles, internal resistance drops and the warmth settles.