About this replacement
Asus GL502V Series — 15.2V Li-Polymer Replacement Battery (B41N1526)
This 15.2V, 4050mAh (61.56Wh) lithium-polymer battery replaces the original B41N1526 cell in the Asus ROG GL502V gaming laptop. It fits the GL502V, GL502VT-BSI7N27, GL502VT, and over 190 additional GL502 variants sharing the same connector and BMS handshake profile. Capacity figures come from the product data — not estimated from a third-party source.
- GL502 platform compatibility: Every model in the GL502 line runs the same 15.2V four-cell Li-Polymer architecture with an identical connector pinout and BMS communication protocol. That shared voltage rail and handshake logic is why one cell covers the full range of GL502 variants without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on a GL502VT unit. The BMS negotiated correctly, charge termination triggered at the expected voltage ceiling, and no cell mismatch errors were logged in the ACPI battery data.
- Post-install calibration on the GL502V: After fitting this cell, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100% without suspending the laptop. This forces the GL502V's BIOS battery learn cycle to reset against the new cell's chemistry and clears the inaccurate health warning that appears after every cell swap.
GL502V shutting down at 20–30% charge shown on screen
This happens when the cell cannot sustain voltage under simultaneous full CPU load and display brightness. The GL502V pulls hard during GPU-intensive workloads, and if the fuel gauge IC hasn't calibrated to the new cell yet, it misreads remaining capacity. The BIOS acts on that bad reading and triggers a protective shutdown before the cell actually reaches zero. Run two full discharge-to-hibernate and uninterrupted-recharge cycles — after that the fuel gauge IC recalibrates and the shutdowns stop.
BIOS reporting new battery health as "poor" or "replace" immediately after install
The GL502V's BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell on first boot. A freshly installed cell has no charge history, so the BIOS flags it as degraded. This is a data mismatch, not a fault with the replacement cell. Complete one full discharge-to-hibernate followed by a full uninterrupted charge to 100% — that learn cycle writes fresh EEPROM data and clears the false health warning.