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Lenovo IdeaPad Flex 5 14IAU7 Replacement Battery 11.52V 4400mAh

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From $98.99 USD $121.99
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Fits Lenovo IdeaPad Flex 5 14IAU7 and related models; replaces OEM part 5B11F38035, 5B11F38038, 5B11F38042, 5B11F38043, L21B3PE0, L21C3PE0, L21D3PE0, L21L3PE0, L21M3PE0.
Rated 11.52V, 4400mAh (50.69Wh) — delivers full-load power for the 14-inch convertible under sustained CPU and display draw without voltage sag.
Connector slots into the battery bay with keyed alignment; locking tab secures flush against the chassis frame for reliable contact during flex hinge cycles.
We bench-tested this cell against a fresh IdeaPad Flex 5 on sustained mixed load; BMS held voltage steady through charge and discharge with no premature cutoff or thermal throttle.
After installation, run one full discharge cycle to system hibernation-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.
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

11.52V

Amp

4400mAh

Lenovo IdeaPad Flex 5 14IAU7 — 11.52V Li-Polymer Replacement Battery (5B11F38035)

This is an 11.52V, 4400mAh (50.69Wh) lithium-polymer battery for the Lenovo IdeaPad Flex 5 14-inch 2-in-1 convertible laptop. It covers the 14IAU7 and 14ALC7 series, including model 82R7006TUK and over 126 additional variants. The OEM part numbers 5B11F38035, 5B11F38038, L21B3PE0, L21C3PE0, L21D3PE0, and related codes all cross to this cell.

  • Flex 5 14IAU7 and 14ALC7 compatibility: Both the Intel IAU7 and AMD ALC7 Flex 5 platforms share the same 11.52V three-cell architecture and identical connector pinout, so one battery covers both processor variants without modification.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake cycles on the Flex 5 platform. The BMS negotiated charge correctly, the fuel gauge IC responded, and no fault codes were logged during the test sequence.
  • Post-install calibration on the Flex 5: After fitting this battery, 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 these models.

BIOS reporting poor battery health immediately after replacement

The Flex 5 BIOS reads cycle count and health data stored in the old cell's EEPROM. When a new cell goes in, that EEPROM data is blank or mismatched, and the BIOS flags it as degraded. This is not a fault with the replacement cell — it is a firmware artefact. Running the battery learn cycle (full discharge to hibernate, then uninterrupted charge to 100%) gives the BIOS enough data to recalculate health correctly. After one or two full cycles, the health status clears.

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

This happens because the fuel gauge IC is still calibrated to the discharge curve of the old, degraded cell. The new cell has a different voltage-versus-capacity curve, so the gauge hits its cutoff threshold well before the cell is actually empty. The fix is to complete two to three full discharge-to-hibernate and full-charge cycles without interruption. Once the IC has mapped the new cell's curve, the reported percentage will align with actual remaining capacity, and the premature shutdowns stop.

Compatible Models

IdeaPad Flex 5 14IAU7 82R7006TUK IdeaPad Flex 5 14IAU7 82R700DUUE IdeaPad Flex 5 14ALC7 82R900B3RM IdeaPad Flex 5 14IAU7 82R7001SFR IdeaPad Flex 5 14ALC7 82R90066UK IdeaPad Flex 5 14ABR8 82XX003BRK IdeaPad Flex 5 14IRU8 82Y00038AU IdeaPad Flex 5 14IRU8 82Y0004QTA IdeaPad Flex 5 16ABR8 82XY003VGE IdeaPad Flex 5 14ABR8 82XX008KMX IdeaPad Flex 5 14ALC7 82R90049JP IdeaPad Flex 5 14IAU7 82R7007ALM IdeaPad Flex 5 14IAU7 82R700EBIN IdeaPad Flex 5 14ALC7 82R900BKMZ IdeaPad Flex 5 14IAU7-82R70029ID IdeaPad Flex 5 14ALC7 82R9006NIN IdeaPad Flex 5 14ABR8 82XX003TVN IdeaPad Flex 5 14IRU8 82Y0003QCF IdeaPad Flex 5 14IRU8 82Y00057MJ IdeaPad Flex 5 16ABR8 82XY004CGM IdeaPad Flex 5 14ABR8 82XX0092FU IdeaPad Flex 5 14ALC7 82R9004SCF IdeaPad Flex 5 14IAU7 82R7007SGE IdeaPad Flex 5 14IAU7 82R700ETAU IdeaPad Flex 5 14ALC7 82R900C2PG IdeaPad Flex 5 14IAU7 82R7002RPG IdeaPad Flex 5 14ALC7 82R90077MX IdeaPad Flex 5 14ABR8 82XX004FTA IdeaPad Flex 5 14IRU8 82Y00047IV IdeaPad Flex 5 14IRU8 82Y0005PBM IdeaPad Flex 5 16ABR8 82XY004VSC IdeaPad Flex 5 14ABR8 82XX009JMZ IdeaPad Flex 5 14ALC7 82R90059MZ IdeaPad Flex 5 14IAU7 82R7008MGE IdeaPad Flex 5 14IAU7 82TA0002BR IdeaPad Flex 5 16IRU8 82Y10005AU IdeaPad Flex 5 14IAU7 82R70038JP IdeaPad Flex 5 14ALC7 82R9007PIV IdeaPad Flex 5 14ABR8 82XX004XYA IdeaPad Flex 5 14IRU8 82Y00066HH IdeaPad Flex 5 16ABR8 82XY005FFR IdeaPad Flex 5 14ABR8 82XX00A1SC IdeaPad Flex 5 14IAU7 82R70094IV IdeaPad Flex 5 14ABR8 82XX0055RM IdeaPad Flex 5 14ALC7 82R9000FBM IdeaPad Flex 5 16ABR8 82XY000BSB IdeaPad Flex 5 14IAU7 82R7003RIX IdeaPad Flex 5 14IAU7 82R700AXPH IdeaPad Flex 5 14ALC7 82R90086MX IdeaPad Flex 5 14IRU8 82Y0006NMZ IdeaPad Flex 5 16ABR8 82XY005YMB IdeaPad Flex 5 14IRU8 82Y00008VN IdeaPad Flex 5 16ABR8 82XY001JKR IdeaPad Flex 5 14IAU7 82R7009LIV IdeaPad Flex 5 14ABR8 82XX005NIN IdeaPad Flex 5 14ALC7 82R9000YHV IdeaPad Flex 5 16ABR8 82XY000KSB IdeaPad Flex 5 14IAU7 82R7004CUE IdeaPad Flex 5 14IAU7 82R700BEGE IdeaPad Flex 5 14ALC7 82R9008NPG IdeaPad Flex 5 14ABR8 82XX000DHH IdeaPad Flex 5 14IRU8 82Y0000TAU IdeaPad Flex 5 16ABR8 82XY001STA IdeaPad Flex 5 14IAU7 82R700A3IV IdeaPad Flex 5 14ABR8 82XX0065MX IdeaPad Flex 5 14ALC7 82R9001GID IdeaPad Flex 5 16ABR8 82XY000TMJ IdeaPad Flex 5 14IAU7 82R7004VHH IdeaPad Flex 5 14IAU7 82R700BWSC IdeaPad Flex 5 14ALC7 82R90095PH IdeaPad Flex 5 14ABR8 82XX000VHH IdeaPad Flex 5 14IRU8 82Y0001ATW IdeaPad Flex 5 16IRU8 82Y1002EMZ IdeaPad Flex 5 14IAU7 82R700ALMZ IdeaPad Flex 5 14ABR8 82XX006MID IdeaPad Flex 5 14ALC7 82R9002BHH IdeaPad Flex 5 16ABR8 82XY0012TW IdeaPad Flex 5 14IAU7 82R7005CFE IdeaPad Flex 5 14IAU7 82R700CDAU IdeaPad Flex 5 14ALC7 82R9009MCK IdeaPad Flex 5 14ABR8 82XX001CMJ IdeaPad Flex 5 14IRU8 82Y0001SMJ IdeaPad Flex 5 16IRU8 82Y1002NGJ IdeaPad Flex 5 14ABR8 82XX0074CL IdeaPad Flex 5 14ALC7 82R9002TTW IdeaPad Flex 5 16ABR8 82XY001ATW IdeaPad Flex 5 14IAU7 82R7005UFE IdeaPad Flex 5 14IAU7 82R700CVFR IdeaPad Flex 5 14ALC7 82R900A4PH IdeaPad Flex 5 14IAU7-82R7000MSB IdeaPad Flex 5 14ABR8 82XX0024CK IdeaPad Flex 5 14IRU8 82Y00029HH IdeaPad Flex 5 16ABR8 82XY002SMZ IdeaPad Flex 5 14ABR8 82XX007LIN IdeaPad Flex 5 14ALC7 82R9003AMJ IdeaPad Flex 5 14IAU7 82R7006BVN IdeaPad Flex 5 14IAU7 82R700DCYA IdeaPad Flex 5 14ALC7 82R900ALCL IdeaPad Flex 5 14IAU7 82R7001ATW IdeaPad Flex 5 14ALC7 82R9005PPG IdeaPad Flex 5 14ABR8 82XX002UID IdeaPad Flex 5 14IRU8 82Y0002RFQ IdeaPad Flex 5 16ABR8 82XY003BSB IdeaPad Flex 5 14ABR8 82XX0083CK IdeaPad Flex 5 14ALC7 82R9003STA IdeaPad Flex 5 14ALC7 82R9005YED IdeaPad Flex 5 14ABR8 82XX0034JP IdeaPad Flex 5 14IRU8 82Y00031SC IdeaPad Flex 5 14IRU8 82Y0004HIV IdeaPad Flex 5 16ABR8 82XY003LSB IdeaPad Flex 5 14ABR8 82XX008CMX IdeaPad Flex 5 14ALC7 82R90042GE IdeaPad Flex 5 14IAU7 82R70073UK IdeaPad Flex 5 14IAU7 82R700E4ID IdeaPad Flex 5 14ALC7 82R900BCYA IdeaPad Flex 5 14IAU7 82R70022US IdeaPad Flex 5 14ALC7 82R9006FUK IdeaPad Flex 5 14ABR8 82XX003LCK IdeaPad Flex 5 14IRU8 82Y0003HID IdeaPad Flex 5 14IRU8 82Y00050IN IdeaPad Flex 5 16ABR8 82XY0045YA IdeaPad Flex 5 14ABR8 82XX008USP IdeaPad Flex 5 14ALC7 82R9004KIX IdeaPad Flex 5 14IAU7 82R7007KIX IdeaPad Flex 5 14IAU7 82R700ELSP IdeaPad Flex 5 14ALC7 82R900BUSP IdeaPad Flex 5 14IAU7-82R7002JSB IdeaPad Flex 5 14ALC7 82R9006XAX IdeaPad Flex 5 14ABR8 82XX0048HH IdeaPad Flex 5 14IRU8 82Y00040IV

Replaces Part Numbers

5B11F38035 5B11F38038 5B11F38042 5B11F38043 L21B3PE0 L21C3PE0 L21D3PE0 L21L3PE0 L21M3PE0

Technical Specifications

Voltage11.52V
Amp Hours4400mAh
Capacity4400mAh
Rate50.69Wh
Net Weight205g /7.23 oz
Gross Weight465g /16.40 oz
Approximate Weight465g /16.40 oz
Dimension 290.50 x 97.80 x 5.80mm

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

My Flex 5 shows the new battery as "0%" or "unknown" right after I installed it — is something wrong with the cell?

Nothing is wrong with the cell. The Flex 5 BIOS reads identity data from the old battery's EEPROM, and a fresh cell presents blank or mismatched data, so the system reports 0% or unknown until it recalibrates. Plug in the charger immediately after install and let it charge uninterrupted to 100% without using the machine. After one full charge-discharge cycle, the fuel gauge IC maps the new cell and the reading normalises.

The Flex 5 charge stops at 80% and won't go higher — is this a faulty battery?

This is a BIOS-controlled charge threshold, not a battery fault. Lenovo's firmware includes a "Battery Conservation Mode" that caps charging at 80% to reduce long-term cell stress, and it ships enabled on many units. Go to Lenovo Vantage, open Power settings, and switch Conservation Mode off. The battery will then charge to 100%.

System info shows the wrong Wh rating — it lists a different capacity than the battery I bought. Why?

The Wh figure shown in system information comes from the EEPROM on the cell, which stores the rated value from the manufacturer's data rather than a live measurement. A small difference between the listed Wh and what the OS reports is normal and does not affect actual capacity or charge behaviour. If the figure is significantly off, run one full discharge to hibernate-cutoff and a complete charge to 100% — the fuel gauge IC will recalculate and update the reported value against the new cell's actual chemistry.

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Lenovo IdeaPad Flex 5 14IAU7 82R7006TUK Replacement Battery, 11.52V, 4400mAh, Li-Polymer 1

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