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Samsung M40 Notebook Replacement Battery SSB-X15LS3 11.1V 4400mAh

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From $62.99 USD $76.99
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Fits Samsung M40, M40 Plus, and related models; replaces OEM part numbers SSB-X15LS3, SSB-X15LS6, SSB-X15LS9, and variants.
Delivers 11.1V and 4400mAh capacity; supplies 48.84Wh to restore full portable operation on M40 series notebooks.
Connector slides into the original battery bay with standard Samsung latch; orientation marked on the pack itself.
We bench-tested this cell in an M40 chassis under sustained CPU and display load; BMS held voltage curve steady through discharge cycles.
After installation, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings that appear after every cell swap.
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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

11.1V

Amp

4400mAh

Samsung M40 Series — 11.1V Li-ion Replacement Battery (SSB-X15LS3)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Samsung M40 and M40 Plus notebook range. It fits the M40, M40 Plus HWM 745, M40 Plus WVM 1600, and over 28 additional M40 Plus variants. Physical dimensions are 204.85 x 48.10 x 21.40mm — confirm clearance before ordering if your bay has been modified.

  • M40 and M40 Plus compatibility: All M40-series models share the same voltage rail, connector pinout, and BMS handshake protocol. The SSB-X15LS3, SSB-X15LS6, SSB-X15LS9, and their regional variants (C, E, S suffixes) are all electrically identical — suffix differences reflect regional packaging, not cell chemistry or connector type.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an M40 unit. The BMS communicated correctly with the system, charge termination triggered at the expected cutoff voltage, and no thermal flags were raised during the load cycle.
  • Post-install discharge cycle: After fitting this battery, run one full discharge until the laptop hibernates, 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 every cell swap.

BIOS reporting poor battery health immediately after fitting a new M40 cell

The Samsung M40 BIOS reads health data stored in the battery's EEPROM. When a new cell arrives, this EEPROM contains factory default values that don't match the actual charge history the BIOS expects to see. The system flags this mismatch as degraded health — it is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted full charge. After two to three cycles, the BIOS recalibrates and the health warning clears.

M40 shutting down abruptly at 20–30% charge shown on screen

This happens when the cell cannot sustain voltage under the combined load of the CPU and display — the voltage drops faster than the fuel gauge IC predicted, hitting the protection cutoff before the displayed percentage reaches zero. It is a calibration gap between the old cell's discharge curve and the new cell's actual curve, not a defective battery. Force a full discharge to hibernate-cutoff, then charge to 100% without interruption. After two calibration cycles, the fuel gauge IC maps the new cell's curve accurately and the premature shutdowns stop.

Compatible Models

M40 M40 Plus HWM 745 M40 Plus WVM 1600 M40 Plus WVM 2000 SX15-C16B X15 Plus X20 HVM 740 X20 LVC 730 X20 XVM 1600 X20 XVM 1600 II X20 XVM 1600 III X20 XVM 1600 IV X20 XVM 1600 V X20 XVM 1700 X20 XVM 1730 X20 XVM 730 X20 XVM 740 X25 HVM 750 X25 XVM 1600 X25 XVM 2000 X30 X50 HWM 740 X50 HWM 760 X50 WVM 1600 X50 WVM 2000 X50 XWM 740 X50 XWM 750 NX30 X20 M40 Plus WVM 2000 X50 X25

Replaces Part Numbers

SSB-X15LS3 SSB-X15LS6 SSB-X15LS6/C SSB-X15LS6/E SSB-X15LS6S SSB-X15LS9 SSB-X15LS9S SSB-X15LS9/C SSB-X15LS9/E

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 204.85 x 48.10 x 21.40mm

Product Highlights

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

Frequently Asked Questions

My M40 shows the new battery as "0% available (plugged in, charging)" and it never moves — what's wrong?

The fuel gauge IC on the M40 motherboard lost its reference point when the old cell was removed. It has no baseline to calculate state-of-charge against the new cell's chemistry. Leave the laptop plugged in and let the charge run uninterrupted to 100%, then run a full discharge to hibernate. After one complete cycle the IC re-establishes its reference and the percentage starts tracking correctly.

Windows shows this battery's Wh rating as lower than the 48.84Wh listed — is the cell underspec?

No. The Wh figure Windows reads comes from the EEPROM embedded in the battery, which stores the manufacturer's rated value at time of production. The EEPROM value and the measured capacity under real load can differ by 5–10% depending on temperature and discharge rate — this is normal across all Li-ion notebook cells. The 48.84Wh in the product data reflects the actual cell capacity; the EEPROM figure is a static label, not a live measurement. No action is needed.

The M40 charges the new battery to 80% then stops — is the charging circuit faulty?

This is a BIOS-controlled charge limit, not a hardware fault. Some Samsung M40 BIOS versions activate a battery conservation mode that caps charging at 80% to reduce long-term cell stress. Check the Samsung Battery Manager utility in Windows — if conservation mode is enabled, disable it. After disabling, plug in the laptop and the charge will continue past 80% to 100%.

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