Lenovo A500 BATDAT20 Replacement Battery 11.1V 3800mAh
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Lenovo A500 BATDAT20 Replacement Battery 11.1V 3800mAh - 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.
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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
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Lenovo A500 BATDAT20 Replacement Battery 11.1V 3800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
3800mAh
Lenovo A500 / E680 Series — 11.1V Li-ion Replacement Battery (BATDAT20)
This is an 11.1V, 3800mAh (42.18Wh) Li-ion battery that replaces the OEM BATDAT20 cell. It fits the Lenovo A500, E600, E660, and E680 notebooks. The connector and BMS handshake match the original, so the system recognises it on first boot.
- A500 / E600 / E660 / E680 platform fit: These four models share the same 11.1V battery bay, connector pinout, and BMS communication protocol. One cell covers all four without adapter or modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an E680 unit. The BMS negotiated correctly, the fuel gauge IC registered the new cell, and charge reached 100% without interruption.
- Post-swap discharge cycle on first use: After installing, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This triggers the BIOS battery learn cycle and clears the inaccurate health warning that appears after any cell swap on this platform.
BIOS reporting poor battery health after swapping the BATDAT20 cell
The Lenovo BIOS reads health data stored in the battery's EEPROM, not live cell voltage. When a new cell arrives, that EEPROM data either reads as unfamiliar or shows degraded values from the manufacturing default. The system logs a health warning until the learn cycle resets the stored parameters. One full discharge-to-hibernate followed by a full charge resolves this on the A500 and E-series platforms.
Laptop shuts down at 20–30% shown on the fuel gauge
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under combined CPU and display load, the new cell's actual voltage curve doesn't match the stored model, so the gauge misreads remaining capacity. The system hits its low-voltage cutoff well before the displayed percentage reaches zero. Two to three full discharge-to-hibernate and full-charge cycles recalibrate the gauge — check that the cutoff voltage at hibernate is no lower than 9.0V across the pack.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
Why does my Lenovo show 0% or "unknown battery" right after I put in the new BATDAT20 cell?
The fuel gauge IC on these Lenovo models reads EEPROM data written by the previous cell. A fresh cell arrives with default or mismatched EEPROM values, so the OS reports 0% or flags the battery as unknown. Run a full discharge to hibernate, then charge uninterrupted to 100% — this forces the gauge IC to re-initialise against the new cell's chemistry. After one or two cycles the percentage reading stabilises.
The laptop cuts out suddenly around 25% remaining — is the replacement cell faulty?
Not necessarily. Under full CPU plus display load, the voltage across the pack drops faster than the fuel gauge expects. If the gauge IC is still calibrated to the old cell's discharge curve, it doesn't see the voltage cliff coming and the BIOS hits its hardware cutoff before the display reaches 0%. Run two full discharge-to-hibernate cycles and check that the pack voltage at hibernate is sitting between 9.0V and 9.5V — if it is, the cell is fine and the gauge just needs recalibration cycles.
My Lenovo E680 shows 42Wh in one system tool but a different Wh figure in another — which is correct?
The 42.18Wh figure in the battery's EEPROM is the rated value written at manufacture. Some OS tools read that EEPROM field directly; others calculate Wh live from current voltage and the fuel gauge's state-of-charge estimate, which drifts until the gauge is calibrated. The product-data figure of 42.18Wh (3800mAh at 11.1V nominal) is the authoritative spec. After two full calibration cycles the live-calculated figure should converge close to that number.
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