About this replacement
Asus ROG G752VY Series — 15V Li-ion Replacement Battery (A42N1520)
This is a 15V, 5600mAh (84Wh) Li-ion replacement battery for the Asus ROG G752VY-T7031T and the broader G752VY/G752VS series gaming notebooks. It slots into the original battery bay and reconnects to the same 4-cell power circuit the A42N1520 uses. Install it when the original cell can no longer sustain voltage under GPU and CPU load.
- G752VY and G752VS platform fit: These models share the same 15V four-cell battery architecture, connector pinout, and BMS handshake protocol — which is why one part number covers the full G752 range including the GFX72VS6820 and GC026T variants.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on a G752VY unit. The BMS communicated correctly with the BIOS, reported accurate state-of-charge, and held voltage stable through sustained CPU and dGPU load without triggering a low-voltage cutoff.
- First-cycle reset on the G752VY: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to recalibrate against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the G752VY shuts down at 20–30% shown on the gauge
A degraded original cell loses its ability to sustain voltage under the combined draw of the GTX 980M GPU, the i7 CPU, and the 17-inch display at full brightness. The BIOS will cut power when the cell voltage drops below its minimum threshold — even if the fuel gauge still reads 25% remaining. The gauge reads capacity, not real-time voltage; those two figures diverge sharply on worn cells. Fitting a new cell with a fresh nominal voltage restores the gap between the cutoff floor and the actual usable range.
BIOS reporting battery health as poor immediately after fitting a new cell
The G752VY BIOS reads health data from the battery's EEPROM, which stores cycle count and charge history from the previous cell. A brand-new cell arrives with EEPROM values that don't match the system's expectations, so the BIOS flags it as degraded or unknown. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — this triggers the battery learn cycle and rewrites the health register. After two to three full cycles the reported health figure normalises to a value consistent with a new cell.