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MSI GF63 8RC-005CN Replacement Battery 11.4V 4500mAh BTY-M6K

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From $69.99 USD $86.99
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Fits MSI GF63 8RC-005CN and GF75 Thin series notebooks; replaces OEM part number BTY-M6K.
11.4V 4500mAh lithium-polymer delivers 51.3Wh to restore extended unplugged work and gaming sessions.
Connector clips directly into the internal slot; polarized design prevents backward insertion during installation.
Bench testing showed the BMS accepted full charge cycles without early cutoff or voltage sag issues.
After installation, run one full discharge to hibernation then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell swaps.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.4V

Amp

4500mAh

MSI GF63 8RC-005CN / GF75 Thin 8RC Series — 11.4V Li-Polymer Replacement Battery (BTY-M6K)

This is an 11.4V 4500mAh (51.3Wh) lithium-polymer replacement battery for the MSI GF63 and GF75 Thin 8RC series notebooks. It fits directly to the BTY-M6K connector and BMS interface inside these mid-range gaming laptops. If your original cell no longer holds charge, reports 0% in Windows, or triggers an immediate shutdown under CPU load, this is the direct swap.

  • GF63 and GF75 Thin 8RC platform fit: Both the GF63 and GF75 Thin 8RC lines share the same BTY-M6K battery connector pinout, BMS handshake protocol, and 11.4V three-cell rail. A single cell design covers both platforms without any modification to wiring or firmware.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on GF63 hardware. The EC correctly identified the battery, the BMS negotiated charge termination cleanly at 100%, and no overcurrent fault codes were logged during a sustained gaming load test.
  • Post-install calibration on the GF63: After fitting, run one full discharge to hibernate cutoff, 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 MSI notebooks.

BIOS reporting poor battery health immediately after replacing the BTY-M6K

The MSI EC reads health data from the EEPROM on the old cell. When a new cell is installed, that EEPROM data resets — the EC sees an unfamiliar cycle count signature and flags the battery as degraded or unknown. This is not a fault with the replacement cell. Run the BIOS battery learn cycle: discharge fully to hibernate, then charge straight to 100% without interruption. After one complete cycle, the EC rewrites its health baseline against the new cell's data, and the warning clears.

GF63 shutting down at 20–30% remaining during gaming or heavy CPU load

This is a voltage cliff issue. Under combined CPU, GPU, and display load, the cell voltage drops faster than the fuel gauge IC can track. The EC sees a voltage that falls below its safe threshold — even when the reported percentage still looks acceptable — and triggers an emergency shutdown to protect the system. The fuel gauge IC needs two to three full calibration cycles before its percentage readings match actual cell voltage accurately. Charge to 100%, work normally until automatic hibernate, repeat twice — after that the EC fuel gauge tracks the cell correctly and the early shutdowns stop.

Compatible Models

GF63 8RC-005CN GF75 Thin 8RC GF75 8RC-206RU Thin GF75 Thin 8RC-055XPL GF63 8RC-053BE GF63 8RD-251 GF75 8RD-076IN GF75 Thin 8RD-076IN GF63 8RD-006CN GF75 Thin 3RD GF75 THIN 9SC GF75 Thin 8RD-050XFR GF63 Thin 9SC GF63 8RC-074AU GF63 8RD-291XES GF75 Thin 8RD-070ZA GF75 THIN 8RD-204TR GF63 8RC-022TH GF63 8RD-031TH GF75 Thin 8RD-017CN GF75 8RD-043XRU GF75 Thin 9SC-070CN GF63 9SC-089CN GF63 8RC-209TR GF63 8RC-465KH MS-17F1 GF75 8RC-064NL GF63 8RC-035MY GF63 8RD-066xx GF75 8RD-016TW GF75 8SC GF75 9SC-069CN GF63 Thin 9SC-089CN GF63 8RD-001CN 0017F1-002 GF75 8RC-039XTR GF63 8RC-052NL GF63 8RD-095XPL GF75 THIN-8RX GF63 8RC-004CN GF75 Thin 8RD GF75 8RC-077IN GF75 8RD-018CZ GF63 9SC GF63 8RC-057NL GF63 8RD-010ES GF75 8RD-009AU GF75 Thin 9S7-17F112-007 GF75 Thin 8RD-014CN GF75 Thin 9SC-027 GF75 9SC-070CN GF63 9SC-088CN GF63 8RC-075AU GF63 8RD-010XES GF75-THIN-8RD-201NZ GF75 Thin 9SC-061XES GF63 8RC-034CZ GF63 8RD-050NL GF75 Thin 8RD-019CN GF75 8RD-042RU GF75 Thin 9SC-069CN GF63 Thin 9SC-088CN GF63 8RC-230 GF63 8RC-431KH GF75 8RD-002 GF75 Thin 8RD-074FR GF63 8RC-040XPL GF63 8RD-078IN GF75 8RD-001 GF75 Thin 8RD-059PL GS63VR 7RG-005 GF75 8RD GS63VR 7RG Stealth Pro GF63 GF75 GF63 8RC GF63 8RD GS73VR 7RG GS63VR 7RG

Replaces Part Numbers

BTY-M6K

Technical Specifications

Voltage11.4V
Amp Hours4500mAh
Capacity4500mAh
Rate51.3Wh
Net Weight291.4g /10.28 oz
Gross Weight431.4g /15.22 oz
Approximate Weight431.4g /15.22 oz
Dimension 216.20 x 91.15 x 5.40mm

Product Highlights

  • Brand: MSI
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My GF63 shows the BTY-M6K battery as "0% available (plugged in, not charging)" right after I installed a new one — what's wrong?

The fuel gauge IC on the MSI EC still has voltage curve data mapped to the old, degraded cell. When the new cell's resting voltage doesn't match the expected profile, the EC stalls charge initiation and reports 0%. Shut the laptop down completely, unplug the AC adapter for 30 seconds, then reconnect and power on. If the EC still stalls, enter the BIOS, navigate to the battery settings, and trigger a reset — this clears the cached profile and lets the EC re-handshake with the new cell's EEPROM.

Windows Battery Report shows the BTY-M6K's design capacity as 45,000mWh but the "last full charge" is listed as something completely different — is the cell faulty?

This is an EEPROM mismatch, not a cell fault. The BTY-M6K EEPROM stores rated Wh data that the EC reads on first contact. The Windows Battery Report pulls that EEPROM value before the fuel gauge IC has completed even one calibration cycle, so "last full charge" reflects the old learned curve, not the new cell's actual capacity. Run two full discharge-to-hibernate then charge-to-100% cycles. After that, the fuel gauge IC rewrites its learned capacity against the real chemistry of the new cell, and the Battery Report figures align.

The replacement battery charges fine but stops at exactly 80% every time — is there a fault with the cell?

This is a BIOS-controlled charge limit, not a battery fault. MSI notebooks ship with a battery charge limiter in the EC firmware — often enabled via MSI Center or Dragon Center — that caps charging at 80% to reduce cell stress during long AC-connected use. Open MSI Center, go to Battery, and switch the charge mode from "Best for Battery" to "Best for Mobility." The EC will then allow a full charge to 100% on the next charge cycle.

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