Lenovo Yoga Slim 7 ProX L21C4PC4 Replacement Battery 15.52V
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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Lenovo Yoga Slim 7 ProX L21C4PC4 Replacement Battery 15.52V - 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.
Lenovo Yoga Slim 7 ProX L21C4PC4 Replacement Battery 15.52V - is backordered and will ship as soon as it is back in stock.
Voltage
15.52V
Amp
4450mAh
Lenovo Yoga Slim 7 ProX 14IAH7 / 14ARH7 — 15.52V Li-Polymer Replacement Battery (L21C4PC4)
This 15.52V, 4450mAh (69.06Wh) Li-Polymer battery replaces the original L21C4PC4, L21D4PC4, L21D4PE0, and L21L4PC4 cells found in the Lenovo Yoga Slim 7 ProX and Yoga Slim 7 Pro 14-inch series. It fits the 82TK and 82TL chassis variants, including the 82TK0076MX, 82TL003TKR, 82TK0025IN, and 82SV00AJCL, among 121 additional model codes. Voltage, connector pinout, and BMS communication lines match the original specification.
- Yoga Slim 7 ProX / 7 Pro 14-inch compatibility: The 82TK, 82TL, and 82SV chassis all run the same 15.52V power rail with an identical 4-pin SMBus connector. The BMS handshake protocol across these models accepts the same EEPROM identifiers, so the battery registers correctly in Lenovo Vantage and the firmware without modification.
- Bench tested on actual hardware: We cycled this cell on an 82TK unit, monitoring BMS communication, charge acceptance, and cutoff behaviour under sustained CPU and display load. The cell reached full charge acceptance and the BMS reported state-of-charge accurately within three cycles.
- Post-install learn cycle on the Yoga Slim 7 ProX: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The Yoga Slim 7 ProX uses a BIOS-level battery learn cycle — skipping this step leaves the fuel gauge IC calibrated against the old cell's data, which triggers inaccurate health warnings in Lenovo Vantage.
BIOS reporting poor battery health immediately after fitting a new cell
The Lenovo BIOS reads health data from the battery's EEPROM, not from live voltage measurements. When a new cell is installed, the EEPROM carries rated factory values that don't match the BIOS's stored history for the previous cell, so the firmware flags the battery as degraded or unknown. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS learn cycle re-writes the reference data against the new cell's actual chemistry. After two to three cycles, the health indicator in Lenovo Vantage should clear.
Laptop shuts down at 20–30% charge shown after battery swap
This happens when the fuel gauge IC is still calibrated against the old, degraded cell's voltage curve. The new cell's voltage at 20–30% state-of-charge sits higher than the old cell's equivalent point — but the IC interprets that voltage as nearly depleted and triggers shutdown. The fix is a full discharge-to-hibernate sequence: let the laptop run on battery with screen at full brightness until it hibernates automatically, then charge to 100% without interruption. Repeat this once more if the gauge is still drifting — by the second cycle the IC recalibrates and the 15.52V cutoff threshold maps correctly to the new cell.
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
My Lenovo Yoga Slim 7 ProX shows the new battery as 0% or "unknown" in Lenovo Vantage — what's wrong?
The BIOS read the EEPROM from your old cell and stored that as the reference point. The new cell's EEPROM data doesn't match, so the firmware can't reconcile the two and reports unknown or 0%. Run a full discharge to hibernate-cutoff, then charge uninterrupted to 100% — this forces the BIOS battery learn cycle to rewrite its reference data against the new cell. After one complete cycle, Vantage should display an accurate charge percentage.
The Yoga Slim 7 ProX charge stops at 80% and won't go higher — is the replacement cell faulty?
This is a BIOS-controlled charge limit, not a cell fault. Lenovo's firmware includes a battery conservation mode that caps charging at 80% to reduce long-term cell stress — it ships enabled on many units. Open Lenovo Vantage, go to Power, then Battery Settings, and switch the charge threshold from "Conservation" to "Normal" or "Full Charge." The cell will then charge to 100%.
Why does the system info page show a different Wh rating than the 69.06Wh listed for this battery?
The Wh figure displayed in Windows or Lenovo Vantage is pulled from the battery's EEPROM, which stores the manufacturer's rated design capacity — this value can differ slightly from the actual measured capacity of the new cell's chemistry. The discrepancy is an EEPROM reporting difference, not a sign of a wrong or underspec cell. Confirm the voltage reads 15.52V in Vantage or HWiNFO
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