About this replacement
Asus GL502VS-GZ422T — 15.2V Li-Polymer Replacement Battery (C41N1531)
This is a 15.2V, 4000mAh (60.8Wh) lithium-polymer replacement battery for the Asus ROG GL502VS-GZ422T and related GL502 series gaming laptops. It replaces OEM part numbers C41N1531, 0B200-0194000, and 0B200-01940100. The battery slots into the GL502VS, GL502VY, and ROG Strix G502VS lines that share the same four-cell 15.2V power rail and connector layout.
- GL502 series compatibility: The GL502VS, GL502VY, and G502VS platforms all run the same 15.2V four-cell architecture with an identical BMS handshake protocol. That shared electrical spec is why one cell covers all three lines — not just a connector match.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on GL502VS hardware. The BMS completed full handshake without fault codes, and charge termination triggered correctly at capacity without overcharge events.
- Post-install calibration for GL502 series: After fitting this cell, run the laptop down to hibernate cutoff on a moderate workload, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the false "poor health" flag that appears after every cell swap on ROG firmware.
BIOS reporting poor battery health after fitting a new GL502 cell
Asus ROG firmware reads health data from EEPROM stored on the old cell. When a new cell goes in, that EEPROM register is blank or mismatched, so the BIOS flags the battery as degraded before it has run a single cycle. This is a firmware calibration state, not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the fuel gauge IC write fresh baseline data. After that cycle, BIOS health reporting normalises.
GL502VS shutting down at 20–30% charge shown on-screen
This happens when the cell voltage drops below the BMS cutoff threshold under full CPU and display load, even though the OS fuel gauge still shows charge remaining. The fuel gauge IC is reading stored EEPROM estimates, not live cell voltage — the two fall out of sync after a cell swap. Under a gaming workload, the sudden current draw exposes the voltage cliff faster than the gauge can update. Run two full calibration cycles and confirm the BIOS sees the cell at 60.8Wh in the battery report before concluding there is a cell fault.