About this replacement
Asus ROG Ally (2023) RC71L NR2301L — 15.48V Li-Polymer Replacement Battery (C41N2208)
This is a 15.48V, 2500mAh (38.7Wh) Li-Polymer cell built to the C41N2208 specification for the Asus ROG Ally (2023) handheld gaming console. It fits the RC71L and NR2301L variants. Swap it in when the original cell no longer holds enough charge to sustain portable play sessions.
- RC71L and NR2301L compatibility: Both variants run the same 15.48V four-cell series configuration with the C41N2208 connector and BMS pinout. The cell capacity and protection circuit thresholds are identical across both, so one replacement covers either board revision without modification.
- Bench tested on actual hardware: We ran the C41N2208 through charge and discharge cycles on the ROG Ally platform. The BMS accepted the cell without fault flags, balanced correctly across all four cells, and the protection circuit tripped cleanly at the expected low-voltage cutoff threshold.
- Post-install recalibration on the ROG Ally: After fitting this cell, run one full discharge until the device hibernates, then charge uninterrupted to 100%. The ROG Ally's fuel gauge IC needs this cycle to build an accurate capacity map against the new cell. Skipping it causes the OS to show wildly inaccurate charge percentages for the first several sessions.
Why the ROG Ally shuts down at 20–30% after a battery swap
The ROG Ally pulls hard on the CPU and GPU simultaneously during demanding titles. Under that combined load, a new cell that hasn't been calibrated hits a steep voltage drop earlier than the fuel gauge expects. The system reads the voltage cliff as a critical battery event and forces shutdown even though the displayed percentage looks safe. Running two full calibration cycles resolves this by teaching the fuel gauge IC where the actual voltage floor sits under load.
BIOS reporting battery health as poor immediately after fitting the C41N2208
When you swap the physical cell, the EEPROM data stored from the old battery stays cached in the system. The BIOS compares the new cell's charge state against that stale EEPROM profile and flags a health mismatch. This is a data artefact, not a fault with the replacement cell. Clear it by running the full discharge-to-hibernate then uninterrupted charge cycle — the BIOS battery learn cycle overwrites the old EEPROM values and the health warning disappears.