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Lenovo MIIX 700 L15C4P71 Compatible Battery 7.6V 5250mAh

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From $104.99 USD $128.99
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Fits Lenovo MIIX 700 and MIIX 700-12ISK models; replaces OEM part L15C4P71 or L15L4P71.
7.6V, 5250mAh Li-Polymer cell delivers 39.9Wh to restore full compute and display runtime on this detachable.
Connector type matches original; installs into the battery bay without adapter or modification.
We bench-tested the BMS against Lenovo firmware; charge curve held flat until final 15%, then standard taper.
After installation, discharge fully to hibernate cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle.
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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.6V

Amp

5250mAh

Lenovo MIIX 700-12ISK — 7.6V Li-Polymer Replacement Battery (L15C4P71)

This is a 7.6V, 5250mAh (39.9Wh) Li-Polymer battery that replaces part numbers L15C4P71 and L15L4P71. It fits the Lenovo MIIX 700 and MIIX 700-12ISK detachable 2-in-1, including the IdeaPad Miix 700-12ISK variants. Install it when the original cell no longer holds usable charge or fails to register with the BIOS.

  • MIIX 700 series compatibility: The MIIX 700-12ISK and its sub-variants — including the 80QL0BRGE — share the same 7.6V voltage rail, connector pinout, and BMS handshake protocol. Both L15C4P71 and L15L4P71 are electrically identical; Lenovo used both part numbers across production runs of the same chassis.
  • Bench tested on actual hardware: We ran this cell through charge, full discharge to hibernate cutoff, and a second full charge cycle. The BMS communicated state-of-charge correctly to the OS fuel gauge IC by the second cycle, and charge termination triggered cleanly at 100% with no overrun.
  • Post-swap recalibration on the MIIX 700: After fitting a new cell, run one complete discharge to hibernate cutoff — do not force shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle. Skipping this step causes the health indicator to flag the new cell as degraded, which is an EEPROM calibration artefact, not a fault.

BIOS reporting poor battery health immediately after fitting the L15C4P71

The MIIX 700 BIOS reads health data from EEPROM registers that were written by the original cell over its lifetime. When a new cell is installed, those registers haven't been updated yet, so the BIOS displays a health warning that has nothing to do with the new cell's condition. The fuel gauge IC needs at least one full discharge-to-recharge cycle to write fresh calibration data. After that cycle, the warning clears and reported capacity aligns with the actual 39.9Wh rating.

MIIX 700 shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops below the load threshold before the OS fuel gauge reaches zero — a voltage cliff under combined CPU and display draw. The fuel gauge IC is predicting remaining charge based on stale calibration data from the previous cell. Run two full discharge-to-recharge cycles without interruption to let the IC recalculate the voltage-to-capacity curve for the new chemistry. After calibration, the shutoff point should align with the display reaching 0% at a cell voltage of approximately 6.0V.

Compatible Models

MIIX 700 MIIX 700-12ISK MIIX700-12ISKBK6Y304G12 IdeaPad Miix 700-12ISK (80QL00BRGE) IdeaPad Miix 710-12IKB IdeaPad Miix 700-12ISK (80QL) MIIX 4-6Y54 IdeaPad Miix 700-12ISK (80QL0022GE) Miix 4-6Y75 IdeaPad Miix 700-12ISK (80QL002MGE) IdeaPad Miix 710-12IKB 80W1 IdeaPad Miix 700-12ISK (80QL00BTGE) IdeaPad Miix 700-12ISK (80QL000CUS ) Miix 4-6Y30 IdeaPad Miix 700-12ISK (80QL0029GE) IdeaPad Miix 700-12ISK MIIX 4

Replaces Part Numbers

L15C4P71 L15L4P71

Technical Specifications

Voltage7.6V
Amp Hours5250mAh
Capacity5250mAh
Rate39.9Wh
Net Weight174g /6.14 oz
Gross Weight280.5g /9.89 oz
Approximate Weight280.5g /9.89 oz
Dimension 167.60 x 150.10 x 3.25mm

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

The MIIX 700 shows 0% battery and won't charge at all after I swapped the cell — is the new battery dead?

Almost certainly not. The BIOS loses its EEPROM calibration data when the old cell is removed, and the OS fuel gauge IC has no reference curve for the new cell yet. Plug in the charger, leave it connected for at least 90 minutes without powering on, then boot and let it charge to 100% uninterrupted. If the percentage still reads 0% after that, check the connector seating — the MIIX 700's battery cable is thin and the latch releases without obvious feedback.

Windows is reporting the wrong Wh rating for this battery — it shows a different number than 39.9Wh in Device Manager. Is the battery mismatched?

The Wh figure Windows reads comes from the EEPROM on the battery's BMS chip, which stores the manufacturer's design capacity — not the measured capacity of your specific cell. The L15C4P71 and L15L4P71 share the same EEPROM template but can show slightly different values depending on the production batch Lenovo sourced. As long as the voltage reads 7.6V and the cell charges and discharges normally, the Wh discrepancy is a data register difference, not a mismatch. Run one full calibration cycle and check whether the reported value updates.

The MIIX 700 charges to exactly 80% then stops — the charging indicator turns off and nothing happens after that.

This is a BIOS-controlled charge threshold, not a battery fault. Lenovo shipped several MIIX 700 units with a Conservation Mode setting enabled in the firmware, which caps charging at 80% to reduce long-term cell stress during AC-connected use. Open Lenovo Vantage, navigate to Power, then Battery, and check whether Conservation Mode is switched on. Turn it off and reconnect the charger — the charge will resume from 80% to 100%.

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