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MSI BTY-M49 Laptop Replacement Battery 11.4V 4400mAh

Up to 19% off
New arrival
From $96.99 USD $119.99
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Fits MSI GS40 Phantom and GSP14 series laptops; replaces OEM battery BTY-M49.
11.4V and 4400mAh Li-Polymer chemistry delivers stable voltage to gaming-class processors under sustained load.
Connector slides into MSI slot with keyed alignment; locking tab secures pack flush against chassis wall.
We tested this cell on a GSP14 under full CPU and GPU draw — BMS held voltage curve clean with no early cutoff observed across discharge cycles.
After installation, run one complete discharge to sleep-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.
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.

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⚠️ 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

4400mAh

MSI Modern 14 Series — 11.4V Li-Polymer Replacement Battery (BTY-M49)

This is an 11.4V, 4400mAh (50.16Wh) Li-Polymer replacement battery for the MSI Modern 14 and GS40 Phantom series laptops. It uses OEM part number BTY-M49 and fits a wide range of MSI notebook models including the Modern 14 B4M (MS-14DK) and Modern 14 B4MW (MS-14DK). The cell dimensions are 251.00 x 94.00 x 5.70mm — verify your original before installing.

  • Modern 14 and GS40 platform fit: These models share the same BTY-M49 voltage rail and three-cell Li-Polymer configuration. The connector pinout and BMS handshake protocol are identical across the MS-14DK board variants, so no firmware workaround is needed for the swap.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an MS-14DK board. The BMS accepted the cell immediately, charge current ramped correctly from CC to CV phase, and the protection circuit triggered cleanly at the low-voltage cutoff threshold.
  • First-cycle calibration after swap: After installing, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after any cell replacement.

Laptop shutting down at 20–30% remaining after battery swap

This happens because the fuel gauge IC on the MSI board still holds calibration data from the old cell. When the new cell's actual voltage under CPU and display load drops below what the old calibration expected, the board treats it as a critical shutdown threshold — even though charge remains. The fix is a full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, repeated two to three times. After that, the fuel gauge recalibrates against the new cell's voltage curve and the early shutdowns stop.

BIOS reporting battery health as "poor" or "replace now" on first boot

The BIOS reads health status from EEPROM data written by the old cell's BMS before it was removed. A fresh cell has no cycle history stored yet, so the BIOS flags it as degraded rather than new. This is a data mismatch — not a fault with the replacement cell. Run the battery learn cycle: discharge fully to hibernate cutoff, charge uninterrupted to 100%, and reboot. The BIOS reads the updated EEPROM state and the health warning clears.

Compatible Models

GSP14 Modern-14-B11SB-273JP Modern 14 B4M(MS-14DK) Modern 14 B4MW(MS-14DK) Modern 14 B10M(MS-14D1) Modern 14 B10RAS(MS-14D1) Modern 14 B10RASW(MS-14D1) Modern 14 B10RASW-053FR Modern 14 B10RASW-054FR Modern 14 B10RBS(MS-14D1) Modern 14 B10RBSW(MS-14D1) Modern 14 B10RBSW-015XIT Modern 14 B10RBSW-025ES Modern 14 B10RBSW-030PL Modern 14 B10RBSW-031PL Modern 14 B10RBSW-032DE Modern 14 B10RBSW-033DE Modern 14 B10RBSW-049DE Modern 14 B10RBSW-052FR Modern 14 B10RBSW-063XES Modern 14 B10RBSW-064XES Modern 14 B11MW(MS-14D2) Modern 14 B11SB-006AU Modern 14 B11SB-008ES Modern 14 B11SB-009XES Modern 14 B11SB-030JP Modern 14 B11SB-050FR Modern 14 B11SB-052FR Modern 14 B11SB-081XPT Modern 14 B11SB-083 Modern 14 B11SB-084 Modern 14 B11SB-085 Modern 14 B11SB-086 Modern 14 B11SB-214CZ Modern 14 B11SB-217ID Modern 14 B11SB-220 Modern 14 B11SB-221 Modern 14 B11SB-235 Modern 14 B11SB-235BN Modern 14 B11SB-236BN Modern 14 B11SB-275KH Modern 14 B11SB-288 Modern 14 B11SB-289 Modern 14 B11SB-290 Prestige 14 Prestige 14 A10M Prestige 14 A10M(MS-14C2) Prestige 14 A10RAS Prestige 14 A10RAS-068AU Prestige 14 A10RAS-075CA Prestige 14 A10RAS-078IT Prestige 14 A10RAS-079 Prestige 14 A10RAS-079P Prestige 14 A10RAS-081ES Prestige 14 A10RAS-084CZ Prestige 14 A10RAS-098CH Prestige 14 A10RAS-214AU Prestige 14 A10RB Prestige14 A10RB Prestige 14 A10RB(MS-14C2) Prestige 14 A10RB-008NL Prestige 14 A10RB-011AU Prestige14 A10RB-015CN Prestige 14 A10RB-019FR Prestige 14 A10RB-020ES Prestige 14 A10RB-021ES Prestige 14 A10RB-023PT Prestige 14 A10RB-024CA Prestige 14 A10RB-025PT Prestige 14 A10RB-027NE Prestige 14 A10RB-036RU Prestige 14 A10RB-042IT Prestige 14 A10RB-046CA Prestige 14 A10RB-047CA Prestige 14 A10RB-218XIT Prestige 14 A10RB-661XPT Prestige 14 A10RD(MS-14C2) Prestige 14 A10SC Prestige 14 A10SC-004NL Prestige 14 A10SC-006NL Prestige 14 A10SC-008RU Prestige 14 A10SC-009 Prestige 14 A10SC-010 Prestige 14 A10SC-011DC Prestige 14 A10SC-012ES Prestige 14 A10SC-014AU Prestige 14 A10SC-015AU Prestige 14 A10SC-020 Prestige 14 A10SC-021 Prestige 14 A10SC-027NE Prestige 14 A10SC-028NE Prestige 14 A10SC-030UK Prestige 14 A10SC-031CZ Prestige 14 A10SC-032FR Prestige 14 A10SC-034FR Prestige 14 A10SC-036CA Prestige 14 A10SC-040XFR Prestige 14 A10SC-046PT Prestige 14 A10SC-048ES Prestige 14 A10SC-049W Prestige 14 A10SC-051 Prestige 14 A10SC-052FR Prestige 14 A10SC-053FR Prestige 14 A10SC-057RU Prestige 14 A10SC-062FR Prestige14 A10SC-065CN Prestige 14 A10SC-067XES Prestige 14 A10SC-071IT Prestige 14 A10SC-072FR Prestige 14 A10SC-073IT Prestige 14 A10SC-074IT Prestige 14 A10SC-075IT Prestige 14 A10SC-077RU Prestige 14 A10SC-079CH Prestige 14 A10SC-080CH Prestige 14 A10SC-091 Prestige 14 A10SC-096NE Prestige 14 A10SC-097AU Prestige 14 A10SC-209CN Prestige 14 A10SC-215PL Prestige 14 A10SC-217PL Prestige 14 A10SC-218FR Prestige 14 A10SC-222ES Prestige 14 A10SC-224DC Prestige 14 A10SC-225DC Prestige 14 A10SC-228FR Prestige 14 A10SC-244FR Prestige 14 A10SC-246CA Prestige 14 A10SC-247CA Prestige 14 A10SC-248CA Prestige 14 A10SC-254CA Prestige 14 A10SC-255CA Prestige 14 A11MT(MS-14C4) Prestige 14 A11SCS-067FR Prestige 14 A11SCX-060ES Prestige 14 A11SCX-205 Prestige 14 A11SCXT(MS-14C4) Prestige 14 Evo A11M-003ES Prestige 14 Evo A11M-005 Prestige 14 Evo A11M-010NE Prestige 14 EVO A11M-011XIT Prestige 14 Evo A11M-066FR Prestige 14 Evo A11M-221 Prestige 14 Evo A11MO-026US Prestige 14 i7-10710U Prestige14051 Summit E14 Summit E14 A11SCS-021UK Summit E14 A11SCS-031TW Summit E14 A11SCS-037ES Summit E14 A11SCS-075FR Summit E14 A11SCS-088 Summit E14 A11SCST Summit E14 A11SCST-069NE Summit E14 A11SCST-071ZA Summit E14 A11SCST-072RU Summit E14 A11SCST-073PL Summit E14 A11SCST-076FR Summit E14 A11SCST-078AU Summit E14 A11SCST-081UK Summit E14 A11SCST-082IT Summit E14 A11SCST-087 Summit E14 A11SCST-223TR Summit E14 A11SCST-263CZ

Replaces Part Numbers

BTY-M49

Technical Specifications

Voltage11.4V
Amp Hours4400mAh
Capacity4400mAh
Rate50.16Wh
Net Weight210g /7.41 oz
Gross Weight470g /16.58 oz
Approximate Weight470g /16.58 oz
Dimension 251.00 x 94.00 x 5.70mm

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 MSI Modern 14 shows the new BTY-M49 battery as 0% or "unknown" in Windows — is it dead?

The fuel gauge IC on the MSI board lost its reference point when the old cell was removed. Windows reads the IC, not the cell directly, so it reports 0% or unknown until the IC re-learns the new cell's voltage curve. Plug in the charger, let it charge uninterrupted to 100%, then discharge fully until the laptop hibernates — one complete cycle is usually enough. After rebooting, the percentage should read correctly.

Windows is reporting this battery as 52Wh but the product spec says 50.16Wh — which is right?

The Wh figure Windows shows is pulled from the EEPROM on the old cell's BMS, which may still be cached in the system's battery report. The physical cell in this replacement is rated at 50.16Wh at 11.4V and 4400mAh — that is the authoritative spec. After one full charge-discharge calibration cycle, run a fresh battery report using `powercfg /batteryreport` in an elevated Command Prompt and the figure will update to reflect the actual cell data.

The BTY-M49 stopped charging above 80% on my MSI laptop — is the new cell faulty?

This is almost always a BIOS charge limit setting, not a cell fault. MSI's ECO charging mode caps charge at 80% to reduce long-term cell stress — it is enabled by default on many Modern 14 builds. Open MSI Center (or Dragon Center on older firmware), go to Battery, and switch from ECO to Best for Mobility mode. If MSI Center is not installed, check the BIOS under Advanced settings for a battery charge threshold option and set it to 100%.

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