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L12S4E01 Lenovo G500 Replacement Battery 14.4V 2200mAh

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From $97.99 USD $116.99
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Replaces Lenovo L12S4E01, L12M4E01, L12L4E01, L12S4A02, and 21 OEM variants across G500, G500S, Z501, S600 and 73 compatible IdeaPad models.
14.4V and 2200mAh (31.68Wh) — matches original output; delivers full runtime on the G500's Core i5/i7 processors without early throttle or cutoff.
Connector is barrel-type; seats into the battery bay slot below the keyboard with a single locking tab that clicks when fully seated and prevents accidental ejection during transport.
We bench-tested against a G500 motherboard; BMS accepted the cell on first insertion without BIOS fault codes and charged to 100% in approximately 4 hours on the stock Lenovo charger.
After installation, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS fuel gauge IC and clears the inaccurate health warnings that appear after every cell swap on Lenovo boards.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

14.4V

Amp

2200mAh

Lenovo G500 / G500S Series — 14.4V Li-ion Replacement Battery (L12S4E01)

This is a 14.4V, 2200mAh (31.68Wh) Li-ion replacement battery for the Lenovo IdeaPad G500 and G500S notebook series. It also fits the Z501 and S600 alongside 73 additional models sharing the same connector and voltage rail. Cross-referenced OEM part numbers include L12S4E01, L12M4E01, L12L4E01, and the L12S4A02 / L12M4A02 / L12L4A02 variants.

  • G500 series compatibility: These models share a common 14.4V power rail, identical BMS handshake protocol, and the same locking slide connector. Swapping between G500 and G500S uses the same cell because Lenovo kept the battery architecture consistent across that production run.
  • Bench tested on actual hardware: We ran this cell on a G500 unit and monitored the BMS through full charge and load cycles. The protection circuit responded correctly to charge termination and over-discharge cutoff without tripping false fault flags.
  • BIOS learn cycle after install: After fitting this battery, run the laptop down to hibernate-cutoff on battery power alone, then charge uninterrupted to 100%. That single cycle resets the BIOS battery learn routine and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the G500 reports poor battery health immediately after a fresh cell install

The G500 stores battery state data in EEPROM on the original cell. When a new cell goes in, the BIOS reads stale cycle count and health metrics from its own firmware cache — not from the new cell directly. That mismatch triggers a poor health flag even though the cell is unused. Running one complete discharge-to-hibernate then a full uninterrupted charge clears the cached data and forces the BIOS to re-evaluate against the new cell's actual charge curve. Until that cycle runs, the health warning is a firmware artefact, not a cell fault.

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

This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. Under combined CPU and display load, the G500 hits a voltage cliff earlier than the gauge predicts, and the system shuts down before the displayed percentage reaches zero. The fix is calibration: let the battery discharge fully to automatic hibernate, then charge straight to 100% without interruption. After two to three of these full cycles, the fuel gauge IC maps the new cell accurately and the early shutdowns stop. Target a resting voltage of approximately 16.8V at full charge to confirm the cell is topping out correctly.

Compatible Models

G500 G500S Z501 S600 IdeaPad Z50-75 IdeaPad Z50-70 G400s G400s Touch G405s G500s Touch G505s Eraser G50 Eraser G50-30 Eraser G50-45 Eraser G50-70 Eraser G50-70A Eraser G50-70M Eraser G50-75 Eraser G50-80 Eraser Z40 Eraser Z40-70 Eraser Z40-75 Eraser Z50 Eraser Z50-70 Eraser Z70 Eraser Z70-70 Eraser Z70-80 G40-30 G40-45 G40-70 G40-70M G50 G50-30 G50-45 G50-70 G50-70M IdeaPad G50 IdeaPad G50-30 IdeaPad G50-45 IdeaPad G50-70 IdeaPad G50-70A IdeaPad G50-70M IdeaPad G50-75 IdeaPad G50-80 IdeaPad S435 IdeaPad Z40 IdeaPad Z40-70 IdeaPad Z40-75 IdeaPad Z50 IdeaPad Z70 IdeaPad Z70-70 IdeaPad Z70-80 Z40 Z40-70 Z40-75 Z50 Z50-70 Z70 Z70-70 Z70-80 IdeaPad G400s IdeaPad G400s Touch IdeaPad G405s IdeaPad G405s Touch IdeaPad G410s IdeaPad G410s Touch IdeaPad G500s IdeaPad G500s Touch IdeaPad G505s IdeaPad G505s Touch IdeaPad G510s IdeaPad G510s Touch IdeaPad S410p IdeaPad S410p Touch IdeaPad S510p IdeaPad S510p Touch IdeaPad Z710

Replaces Part Numbers

L12S4E01 L12M4E01 L12L4E01 L12S4A02 L12M4A02 L12L4A02 121500171 121500172 121500173 121500174 121500175 121500176 90202869 5B10K10161 5B10K10191 5B10K10199 5B10K10206 5B10K10211 5B10K10238 5B10K10240 SB10G46707 SB10F22099 SB10F22078 SB10F22076 SB10D85345 L14C4A01 5B10J39487 5B10H15336

Technical Specifications

Voltage14.4V
Amp Hours2200mAh
Capacity2200mAh
Rate31.68Wh
Net Weight206.1g /7.27 oz
Gross Weight476.1g /16.79 oz
Approximate Weight476.1g /16.79 oz
Dimension 272.05 x 35.37 x 19.87mm

Product Highlights

  • Brand: Lenovo
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My G500 shows 0% or "plugged in, not charging" right after I put in a new battery — what's wrong?

The BIOS cached the old cell's EEPROM state and hasn't accepted the new cell yet. Shut the laptop down completely, remove the AC adapter for 30 seconds, then reconnect and boot. If the charge indicator still reads 0%, run the laptop to hibernate on battery alone, then charge uninterrupted to 100% — that forces the BIOS to re-initialise against the new cell and clears the stuck reading.

Windows says the battery is at 45Wh but the spec shows 31.68Wh — why does the Wh figure look wrong?

Windows pulls the Wh rating from EEPROM data embedded in the battery's BMS chip, which reflects the rated design capacity rather than the usable cell capacity at current state of charge. The 31.68Wh figure in the product data is the actual measured energy at 2200mAh and 14.4V — those numbers are correct. The discrepancy is a firmware reporting difference, not a fault. Check Device Manager under Batteries to confirm the cell voltage reads 14.4V nominal, which confirms the right cell is seated.

The battery charges fine but the percentage jumps around — 60% one minute, 40% the next. Is the cell faulty?

No — the fuel gauge IC on the G500 mainboard needs two or three full calibration cycles to map a new cell's discharge curve accurately. Until those cycles run, the percentage readout is extrapolating from stale reference data and will jump. Run the battery down to automatic hibernate each time, then charge to 100% without interruption. After the third full cycle, the gauge stabilises and the erratic percentage readings stop.

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