5B11F35903 Lenovo Yoga Slim 9 Replacement Battery 15.52V 4700mAh
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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5B11F35903 Lenovo Yoga Slim 9 Replacement Battery 15.52V 4700mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
5B11F35903 Lenovo Yoga Slim 9 Replacement Battery 15.52V 4700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.52V
Amp
4700mAh
Lenovo Yoga Slim 9 14IAP7 — 15.52V Li-Polymer Replacement Battery (5B11F35903)
This is a 15.52V, 4700mAh (72.94Wh) Li-Polymer battery for the Lenovo Yoga Slim 9 14IAP7 ultrabook. It fits across the 82T0 series, covering retail variants from multiple regions including the 82T0001ETA, 82T0001XUK, and 82T0002ESA. Cross-references include OEM part numbers L21B4PH1, L21C4PH1, L21D4PH1, L21L4PH1, L21M4PH1, and SB11F35904.
- 82T0 series compatibility: All Yoga Slim 9 14IAP7 variants under the 82T0 product code share the same four-cell Li-Polymer configuration, 15.52V nominal rail, and physical connector spec. That is why a single cell services 139-plus regional SKUs without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 14IAP7 platform. The BMS handshook correctly with the Lenovo EC firmware, reported capacity data over SMBus, and did not trigger any OVP or UVP cutoff events at normal load.
- BIOS battery learn cycle after install: After fitting this cell, run the laptop down to hibernate-cutoff on battery only — no AC — then charge uninterrupted to 100%. This resets the BIOS learn cycle, clears the inaccurate "poor health" warning that appears after a cell swap, and gives the fuel gauge IC a clean calibration baseline against the new chemistry.
BIOS reporting battery health as poor immediately after replacement
The Lenovo BIOS reads health data from EEPROM on the battery pack, not from a live capacity measurement. When a new cell goes in, the EEPROM data does not match what the system recorded for the old pack, so the BIOS flags it as degraded or unknown. This is a firmware state issue, not a fault with the replacement cell. One complete discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the battery learn cycle and writes fresh data to the gauge IC. After that cycle, the health status in Lenovo Vantage and the BIOS should read normal.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The displayed percentage does not match real cell voltage, so the system hits a low-voltage protection threshold before the gauge reaches 0%. Under combined CPU and display load, voltage sag accelerates this gap. The fix is two or three full discharge-to-charge cycles to let the gauge IC map the new cell's curve accurately. After calibration, the fuel gauge tracks actual cell voltage and the early shutdowns stop — typically resolved once the cell has been below 3.2V per cell and back to full charge twice.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
Why does Lenovo Vantage show "battery not detected" or 0% right after I put the new cell in?
The fuel gauge IC on the new pack holds default EEPROM values that Vantage does not recognise as valid data from the old cell history. Vantage polls the battery over SMBus and, when the health register returns a blank or mismatched value, it reports the pack as absent or at 0%. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% — this triggers the BIOS battery learn cycle and writes a valid state-of-health register that Vantage can read correctly.
The system info page shows the wrong Wh rating — it says 60Wh but the new cell is 72.94Wh. Is something wrong?
Nothing is wrong with the cell. The Wh value displayed in Windows device manager or Lenovo Vantage is pulled from the EEPROM design-capacity register on the pack, which may differ from the actual chemistry until the BIOS learn cycle completes. The 72.94Wh figure is the correct rated capacity for this pack per OEM spec. Complete one full discharge-to-charge cycle and the register updates to reflect the actual cell data — the displayed Wh value should then align with 72.94Wh.
My Yoga Slim 9 14IAP7 stops charging at 80% and won't go higher — is the new battery faulty?
The charge ceiling is almost always set in BIOS or Lenovo Vantage Conservation Mode, not a battery fault. Lenovo's Conservation Mode caps charge at 80% to reduce cell stress during long sessions on AC power. Open Lenovo Vantage, go to Power, select Battery Charge Threshold or Conservation Mode, and switch it off. The charge limit will then extend to 100% on the next charge cycle.
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