Razer Blade 14 2021 Compatible Battery RC30-0370 15.4V 61.6Wh

Razer Blade 14 2021/2022 — 15.4V Li-Polymer Replacement Battery (RC30-0370)

This is a 15.4V, 4000mAh (61.6Wh) Li-Polymer battery carrying OEM part number RC30-0370. It fits the Razer Blade 14 2021 and 2022 series, including AMD Ryzen 9 5900HX and Ryzen 9 6900HX variants. Install it when the original cell no longer holds adequate charge or fails to power the system away from AC.

• Blade 14 2021–2022 platform fit: Both the 2021 and 2022 Blade 14 variants share the same 15.4V four-cell configuration, connector pinout, and BMS handshake protocol — which is why a single RC30-0370 part number covers the full range, including the Ryzen 9 5900HX and 6900HX boards.
• Bench tested on actual hardware: We cycled this cell on a Blade 14 board and monitored the BMS communication across charge and discharge. The protection circuit responded correctly at low-voltage cutoff, and charge termination hit the expected 16.8V peak without triggering any fault flags.
• Post-install calibration on the Blade 14: After fitting this battery, run one full discharge until the system hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Razer's firmware.

Blade 14 shutting down at 20–30% after a battery swap

This happens because the fuel gauge IC still holds calibration data from the degraded original cell. Under full CPU and display load, the new cell's actual voltage profile doesn't match what the IC expects at those state-of-charge percentages. The laptop reads a voltage cliff and triggers an emergency shutdown even though real capacity remains. Run two full discharge-to-hibernate and uninterrupted charge-to-100% cycles — this re-anchors the IC's model to the new cell's actual voltage curve.

BIOS reporting the replacement battery's Wh rating as incorrect

The Wh figure shown in BIOS or Razer Synapse is pulled from EEPROM data embedded in the original cell's BMS, not calculated live from the new cell's chemistry. After replacement, the EEPROM on the new cell reports its own rated value, which may differ slightly from what the old cell had stored. This is a data mismatch between the two cells' firmware tables — not a capacity defect. Confirm the physical spec on the label reads 61.6Wh, then disregard the BIOS figure until the learn cycle completes after the first full charge.