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MSI WT75 8SM Replacement Battery 14.4V 5100mAh BTY-L78

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New arrival
From $87.99 USD $108.99
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Fits MSI WT75 8SM-028CA and replaces OEM part number BTY-L78 directly.
14.4V 5100mAh capacity restores full charge cycles on the WT75 workstation platform.
Connector aligns flush with the battery slot; locking tab seats with firm downward pressure.
We tested the BMS under sustained CPU load — voltage held steady, no premature cutoff observed.
After installation, discharge fully to hibernation then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear health warnings that appear after cell replacement.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

14.4V

Amp

5100mAh

MSI WT75 8SM-028CA / GT75 Series — 14.4V Li-ion Replacement Battery (BTY-L78)

This is a 14.4V 5100mAh (73.44Wh) Li-ion replacement battery carrying OEM part number BTY-L78. It fits the MSI WT75 8SM-028CA mobile workstation along with the GT75 8RF, GT73VR 7RE-298, GT75VR 7RF-033, and over 238 additional MSI configurations. If the original cell no longer holds charge or BIOS flags battery health as degraded, this is the direct swap.

  • WT75 and GT-series platform compatibility: These MSI models share the same 14.4V power rail, BTY-L78 connector pinout, and BMS handshake protocol — which is why a single cell covers the full platform. The BMS communicates remaining capacity and temperature data back to the EC over the same SMBus line across all affected SKUs.
  • Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS trip recovery on a WT75 chassis. The protection circuit responded correctly to over-voltage and thermal thresholds, and the EC recognised the cell without firmware errors.
  • Post-install calibration on MSI EC firmware: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. MSI's embedded controller runs a battery learn cycle against stored EEPROM data — skipping this step leaves BIOS reporting inaccurate health and capacity figures from the old cell.

Why the WT75 shuts down at 20–30% after a battery swap

This is a voltage-cliff failure, not a defective cell. Under combined CPU, GPU, and display load, the new cell's voltage drops faster than the fuel gauge IC expects based on EEPROM data from the previous battery. The EC interprets that voltage drop as an empty cell and triggers an immediate shutdown. Running two to three full discharge-to-charge cycles recalibrates the fuel gauge IC against the actual discharge curve of the new chemistry, and the premature shutdowns stop.

BIOS reporting BTY-L78 replacement as "poor health" or unknown Wh rating

MSI's BIOS reads battery identity and rated Wh from EEPROM data embedded in the cell. A new cell arrives with its own EEPROM values, which can conflict with the health baseline the EC stored from the original battery. This shows up as a health warning or an incorrect Wh figure in BIOS and Windows battery settings — it does not mean the cell is faulty. Perform the full discharge-to-100% learn cycle; the EC rewrites its reference data and the warning clears. If the Wh figure still differs slightly from 73.44Wh in the OS, verify BIOS is on the latest MSI firmware build for the WT75 platform.

Compatible Models

WT75 8SM-028CA GT75 8RF GT73VR 7RE-298(0017A1-298) GT75VR 7RF-033(0017A2-033) GT73VR 6RF4K32SR451 TITAN PRO GT80 TITAN SLI-253 GT83 8RF-009 GT75VR 7RE-013 GT80S 6QE-050CN GT62VR 7RD GT80 2QD-042CN WT75 8SK-026CA WT75 8SL-031PL GT63 Titan 8RG-046 GT73EVR 7RE-838(0017A1-838) GT75VR 8RF GT75VR 7RE(Titan)-004CN GT73EVR 7RF TITAN PRO GT83VR 7RF-094(001815-094) GT73VR 7RF-450CN GT80S 6QE TITAN SLI GT83VR 6RF-011ES TITAN SLI MS-1812 GT75 8RG-090 GT80S-6QF GT75VR 7RE Titan GT83VR 6RF-026CN GT75VR 7RF WT75 8SM-039UK GT75 8RF-037DE GT73VR-7RF-297 GT73EVR 7RD-818CN GT83 8RF-009(001816-009) GT73VR 7RE TITAN SLI GT80-2QE16SR221BW GT83 8RG-008 GT83VR 7RF-203CN GT75VR 7RE-093 GT80S 6QE-218CN GT62VR 7RE Dominator Pro WT75 8SL WT75 8SM-005 GT63 8RF GT73EVR 7RE-894(0017A1-894) GT75 Titan 8RF-003CN GT75VR 7RE-016(0017A2-016) GT73VR 6RE4K32SR451 GT73VR TITAN PRO GT80S-6QD GT83VR 6RF-64SR451 MS-1816 GT75 8RG-002CN GT62VR 6RD Dominator GT80 001812-SKU1 WT75 8SK-004ES GT62VR 6RD-070XES GT75 Titan 8RG-271CN GT75 8RF-035(0017A3-035) GT73EVR 7RE-837 GT83VR 6RE GT73VR 7RE-451CN GT80-2QES16SR351BW GT83 TITAN 8RG GT83VR 7RF-206 GT75VR 7RF-015 GT80S 6QF GT62VR 7RE-261RU WT75 8SL-009ES WT75 8SM-013ES GT63 8RG-014CN GT73EVR 7RF-1200(0017A1-1200) GT75 TITAN 8RF GT75VR 7RF(Titan Pro)-019CN GT73VR 6RESLI4K32SR451 GT80 TITAN SLI-001 GT80S-6QEX32SR42BW GT83VR 7RE GT73VR 6RE16SR451 GT62VR-6RDAC16H11 GT80 2QE-034CN WT75 8SK-008 WT75 8SL-021PT GT63 Titan 8RG-014CN GT75 8RF-003CN GT75 8RG-033(0017A3-033) GT73EVR 7RE-839 GT83VR 6RF GT73VR 7RE-665CN GT80-2QES32SR351BW GT83VR 6RE32SR451 GT80S-6QD16H11BW GT62VR Dominator Pro-005 WT75 8SM-019PT GT75VR 7RF-015(0017A2-015) GT73VR 6RF4K32SR451 GT80 TITAN SLI-071 GT83 8RF GT80S 6QD-267CN GT62VR 6RE-016NL GT80 2QE-035CN WT75 8SK-025CA WT75 8SL-027CA GT75Titan8RG GT73EVR 7RE-837(0017A1-837) GT63 Titan 8RF-014CN GT75 8RG-090(0017A3-090) GT83VR 7RE-094(001815-094) GT73VR 7RF-298 GT83VR 6RF TITAN SLI MS-17A3 GT75 8RG-089 GT80S-6QE32SR42BW GT62VR-6RE-022UK WT75 8SM-029CA GT75 8RF-035 GT73VR-7RF GT80 2QE GT73VR 7RE GT80 TITAN-047 GT83 8RG GT83VR 7RF-094 GT75VR 7RE-016 GT80S 6QE-217CN GT62VR 7RD Dominator WT75 8SK-032PL WT75 8SL-034RU GT73EVR 7RE-839(0017A1-839) GT75VR 8RF-003CN GT75VR 7RE-013(0017A2-013) GT73EVR 7RF-1200 GT83VR 7RF-206(001815-206) GT80S TITAN SLI-012 GT83VR 6RF-028UK MS-1814 WT75 8SK GT75VR 7RF-012 Titan Pro WT75 8SM-054AU GT75 8RG-271CN GT73VR-7RF-298 GT73EVR 7RE TITAN GT83 8RG-008(001816-008) GT73VR 7RE-298 GT80-2QES16SR221BW GT83 TITAN 8RF GT83VR 7RF-206 TITAN SLI GT80S 6QE-268CN GT62VR 7RE-246XES WT75 8SL-006 WT75 8SM-011ES GT63 8RF-015CN GT73EVR 7RF(Titan Pro)-864CN GT75 8RF-037 GT75VR 7RE-093(0017A2-093) GT73VR 6REAC32SR451 GT75VR TITAN GT80S-6QE32SR42HOS HEROES GT83VR 6RF64SR451 MS-16L1 GT62VR 6RD-056ES Dominator WT75 8SK-007 GT62VR-7RE GT62VR 7RE-223 GT75 8RG-085CN GT75 8RF-037(0017A3-037) GT73EVR 7RE-838 GT83VR 6RE32SR451(001815-SKU2) GT73VR 7RE-471RU TITAN SLI 4K GT80-2QES32SR311BW GT83 TITAN 8RG-020CN GT83VR 7RF-230FR TITAN SLI GT75VR 7RF-033 GT80S 6QF-218CN GT62VR 7RE-456XES GT73VR 6RF-094CN WT75 8SL-015TW WT75 8SM-018 GT63 Titan 8RF-015CN GT75 TITAN 8RG-085CN GT75VR 7RF-012(0017A2-012) GT73VR 6RF TITAN PRO GT80 TITAN SLI-009 GT80S-6QFX32SR45BW ANNIVERSARY GT83VR 7RE-094 GT62VR 6RE Dominator Pro GT80 2QC-221CN WT75 8SK-022PT GT62VR 6RD-093XCN WT75 8SL-023 GT75 TITAN 8RG-002CN GT62VR-6REAC16H21 GT63 8RF-014CN GT75 8RG-089(0017A3-089) GT73EVR 7RE-894 GT83VR 6RF64SR451(001815-SKU1) GT73VR 7RF-297 GT83VR 6RE32SR451TITAN SLI GT75 8RG-033 GT80S-6QE GT62VR Dominator Pro-238 GT73EVR 7RD Titan GT83VR 7RF TITAN SLI GT80 TITAN SLI GT62VR-6RE16H21 GT83VR TITAN SLI GT75 Titan GT73VR 7RF Titan GT83VR 7RF GT73EVR 7RF GT83VR 6RE-026CN GT80 2QE-040CN GT63 MS-1815 GT80 2QE TITAN SLI GT73EVR 7RE MS-17A1 GT73VR 6RE-013CN GT62VR 6RD-033CN GT62VR-6RE GT83VR 6RE-007CN GT75VR 7RF-012 MS-17A2 GT80S 6QD GT62VR-6RD GT80S 6QE GT62VR 6RD GT73VR 7RF-296 GT75VR GT73VR-6RF GT75 8RG GT73VR TITAN GT75VR 7RE GT62VR 6RE GT75VR 7RF Titan Pro GT80 Titan GT73VR-6RE GT83VR GT62VR GT83 GT73VR GT73 GT80S GT80

Replaces Part Numbers

BTY-L78

Technical Specifications

Voltage14.4V
Amp Hours5100mAh
Capacity5100mAh
Rate73.44Wh
Net Weight392g /13.83 oz
Gross Weight532g /18.77 oz
Approximate Weight532g /18.77 oz
Dimension 149.00 x 70.50 x 18.80mm

Product Highlights

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

Frequently Asked Questions

The OS fuel gauge on my WT75 is jumping around — showing 60%, then 45%, then back to 55% within minutes of unplugging. Is the new battery faulty?

No — this is the fuel gauge IC recalibrating against the new cell's actual discharge curve. The IC's stored model was built on the old battery's chemistry data, so readings are erratic until it collects new cycle data. Run two full discharge-to-hibernate then charge-to-100% cycles without interruption. After that the gauge stabilises and tracks within a few percent.

My WT75 stops charging at exactly 80% after fitting the BTY-L78. It has been on the charger for hours and won't move past that point.

This is MSI's BIOS charge-limit feature, not a fault with the cell. Some MSI firmware builds ship with a charge threshold set at 80% to reduce long-term cell stress — it applies to replacement cells the same as the original. Go to MSI Dragon Center or MSI Center, find Battery Master or Battery Settings, and switch the charge mode from "Best for Battery" to "Full Charge." The cell will then charge to 100%.

Windows Device Manager is showing the BTY-L78 as an unknown device with 0mWh remaining, even though the laptop runs fine on it.

This happens when Windows hasn't yet received valid EEPROM data from the new cell's BMS over SMBus. The driver sees no recognised battery identity and logs 0mWh. Fully shut down the laptop — not restart — remove the AC adapter for 30 seconds, reconnect, then boot. This forces the EC to re-enumerate the battery bus and pass cell identity to the Windows battery driver. If the unknown device persists after one full discharge cycle, update the MSI EC firmware from MSI's support page for the WT75.

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