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Lenovo IdeaPad Flex 5 Replacement Battery 11.55V 5B10X49072

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From $89.99 USD $110.99
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Fits IdeaPad Flex 5 models — replaces Lenovo part numbers 5B10X49072, L19C3PD6, L19M3PD6, SB10X49076, SB10X49078, L19D3PD6, and SB10X49071.
Voltage output is 11.55V with 4500mAh capacity, delivering 51.98Wh total — sufficient for full-day unplugged sessions on standard office workloads.
Li-Polymer cell uses the factory connector orientation and sliding latch — no modification needed, slides straight into the battery bay.
We ran full charge cycles on the Flex 5's integrated fuel gauge IC; BMS delivered steady voltage curve with no early cutoff or communication faults.
After installation, discharge fully to hibernation-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warnings that appear after every cell swap.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off 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

11.55V

Amp

4500mAh

Lenovo IdeaPad Flex 5 — 11.55V Li-Polymer Replacement Battery (5B10X49072)

This 11.55V, 4500mAh (51.98Wh) Li-Polymer battery fits the Lenovo IdeaPad Flex 5 convertible notebook series. It replaces OEM part numbers including L19C3PD6, L19M3PD6, L19D3PD6, SB10X49071, SB10X49076, and SB10X49078. Confirmed fitment includes 81CA001KUS, 80XA000YUS, 80XB000TUS, and over 40 additional Flex 5 configurations.

  • Flex 5 platform compatibility: These Flex 5 variants share a common battery connector pinout, BMS handshake protocol, and 11.55V nominal rail — all covered by this cell. The SMBus communication lines match the Flex 5 motherboard's fuel gauge IC without modification.
  • Bench tested on actual hardware: We ran this cell on a Flex 5 unit and confirmed the BMS initialised correctly on first boot. Charge acceptance was normal across the full voltage range, and the system reported battery presence without error codes.
  • Post-installation learn cycle: After fitting, discharge the laptop fully to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor after replacement

The Flex 5 BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported state. A fresh cell has no charge history logged, which the BIOS interprets as a mismatch and flags as degraded. This is not a fault with the replacement cell — it is a calibration gap. Run one full discharge-to-hibernate then a full uninterrupted charge; the BIOS learn cycle will write new baseline data and clear the warning.

Laptop shuts down at 20–30% shown on the fuel gauge

The fuel gauge IC on the Flex 5 motherboard stores discharge curve data calibrated to the original cell. After a cell swap, those stored curves no longer match the new cell's actual voltage-to-capacity relationship. When the CPU and display pull full load, the new cell hits a voltage cliff earlier than the gauge predicts — the system interprets this as a critical low-power event and shuts down before the displayed percentage reaches zero. Run two to three full discharge-and-charge cycles; the gauge IC recalibrates its internal model against the new cell's actual curve, and the shutdowns stop. Confirm the cell is holding above 10.5V at the point the system previously cut out.

Compatible Models

IdeaPad Flex 5 IdeaPad Flex 5 81CA001KUS IdeaPad Flex 5 80XA000YUS IdeaPad Flex 5 80XB000TUS IdeaPad Flex 5 80XB000DUS IdeaPad Flex 5 81CA000CUS IdeaPad Flex 5 15 IdeaPad Flex 5 81CA000BUS IdeaPad Flex 5 80XB000SUS IdeaPad Flex 5 80XB000RUS IdeaPad Flex 5 80XA0015US Flex 5 14 AMD 81X20005US IdeaPad Flex 5-14IIL05 81X1002GAU IdeaPad Flex 5-14ARE05 81X2009EAU IdeaPad Flex 5-14IIL05 81X1CTO1WW IdeaPad Flex 5-15IIL05 81X3008SAU IdeaPad Flex 5-14IIL05 81X100AGAU IdeaPad Flex 5-14ARE05 81X2009HAU IdeaPad Flex 5-14ARE05 81X2007HAU IdeaPad Flex 5-14ITL05 82HS0088AU IdeaPad Flex 5-14IIL05 81X100F2AU IdeaPad Flex 5-14ARE05 81X2CTO1W IdeaPad Flex 5-14ARE05 81X2009BAU IdeaPad Flex 5-14ITL05 82HS008BAU IdeaPad Flex 5-14IIL05 81X100GVAU IdeaPad Flex 5-15IIL05 81X3005CAU IdeaPad Flex 5-14IIL05 81X1002FAU IdeaPad Flex 5-14ARE05 81X2009DAU IdeaPad Flex 5-14ITL05 82HS00DJAU IdeaPad Flex 5-14IIL05 81X100NBAU IdeaPad Flex 5-15IIL05 81X30066AU IdeaPad Flex 5-14IIL05 81X1006BAU IdeaPad Flex 5-14ARE05 81X2009FAU IdeaPad Flex 5-14ARE05 81X2001SAU IdeaPad Flex 5-15IIL05 81X3CTO1WW IdeaPad Flex 5-14IIL05 81X100CTAU IdeaPad Flex 5-14ARE05 81X200B1AU IdeaPad Flex 5-14ARE05 81X2007KAU IdeaPad Flex 5-14ITL05 82HS0089AU IdeaPad Flex 5-14IIL05 81X100G7AU IdeaPad Flex 5-15IIL05 81X3003DAU IdeaPad Flex 5-14IIL05 81X10024AU IdeaPad Flex 5-14ARE05 81X2009CAU IdeaPad Flex 5-14ITL05 82HS008CAU IdeaPad Flex 5-14IIL05 81X100GWAU IdeaPad Flex 5-15IIL05 81X3005EAU

Replaces Part Numbers

5B10X49072 L19C3PD6 L19M3PD6 SB10X49076 SB10X49078 L19D3PD6 SB10X49071

Technical Specifications

Voltage11.55V
Amp Hours4500mAh
Capacity4500mAh
Rate51.98Wh
Net Weight206g /7.27 oz
Gross Weight466g /16.44 oz
Approximate Weight466g /16.44 oz
Dimension 284.82 x 96.20 x 5.50mm

Product Highlights

  • Brand: Lenovo
  • 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

Windows is showing my new Flex 5 battery as 0% and "not charging" right after installation — is the cell dead?

It is not dead. The fuel gauge IC on the Flex 5 motherboard has no charge history for the new cell and defaults to 0% until it completes a calibration cycle. Plug in the charger, let the laptop charge uninterrupted to 100%, then discharge fully to hibernate cutoff. After one complete cycle the gauge will read accurately and the "not charging" flag will clear.

My Flex 5 is stopping charge at 80% and won't go higher — what's blocking it?

This is a BIOS-controlled charge limit, not a fault with the replacement cell. Lenovo's firmware includes a battery conservation mode that caps charge at 80% to reduce long-term cell stress. Open the Lenovo Vantage app, go to Power, and check whether Battery Conservation Mode is switched on. Turn it off and the charge ceiling returns to 100%.

System information shows the wrong Wh rating for the new battery — it's reading lower than the 51.98Wh on the label.

The Wh figure shown in Windows Device Manager or Lenovo Vantage pulls from EEPROM data embedded in the cell, which stores the rated chemistry value at manufacture. The OS-reported number can differ slightly from the label figure due to rounding in the EEPROM register versus the calculated value from voltage and capacity. If the reading is within a few watt-hours of 51.98Wh, the cell is correct. Run a full discharge-to-hibernate cycle and the reported value will stabilise as the fuel gauge IC writes updated data against the actual cell.

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