Dell Latitude E5400 Replacement Battery 11.1V 4400mAh
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Dell Latitude E5400 Replacement Battery 11.1V 4400mAh - 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.
Disclaimer
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.
Dell Latitude E5400 Replacement Battery 11.1V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Dell Latitude E5400 / E5500 / E5410 / E5510 — 11.1V Li-ion Replacement Battery (KM668)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Dell Latitude E5400, E5500, E5410, and E5510 notebooks. It uses the same connector and BMS handshake as the OEM cell, so the laptop recognises it without driver changes. OEM part numbers covered include KM668, KM742, MT186, RM649, PW640, WU841, and over 30 additional Dell cross-references.
- E5400 / E5500 / E5410 / E5510 compatibility: These four Latitude models share the same battery bay dimensions, 11.1V power rail, and SMBus handshake protocol — one cell covers all four without any adapter or firmware patch.
- Bench tested on actual hardware: We ran this cell in a Latitude E5400 and E5510. The BMS negotiated correctly with both BIOS versions, charge current stepped down at the expected threshold, and the fuel gauge IC accepted the new cell's EEPROM data without a fault flag.
- Post-install calibration on Dell Latitude: After fitting, run the laptop on battery until it hits hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after replacement
Dell's BIOS stores battery health metrics tied to the original cell's EEPROM data. When a new cell is installed, the old data still sits in memory, so the health indicator reads against it and flags a warning. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — this triggers the battery learn cycle and overwrites the stale EEPROM reference values.
Laptop shuts down at 20–30% charge shown on screen
The fuel gauge IC calibrates its empty-point estimate against the old cell's discharge curve. A new cell has a different voltage cliff — the point where cell voltage drops sharply under full CPU and display load — so the gauge triggers shutdown well before the actual 0% threshold. The fix is two to three full discharge-and-charge cycles, which lets the fuel gauge IC map the new cell's actual voltage curve. After calibration, shutdown should align with the gauge reading below 5%.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Dell
- 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
Dell Latitude E5510 shows 0% and "unknown battery" right after I put the new cell in — is it dead?
The laptop's fuel gauge IC is reading EEPROM data from the old cell and cannot match it to the new one, so it reports 0% or unknown. Run the laptop on battery until it shuts itself down to hibernate, then charge it straight to 100% without interruption. That single discharge-charge cycle resets the BIOS battery learn cycle. After that, the gauge should show a real percentage.
My Latitude E5400 says the new battery is only 40Wh when the spec says 48.84Wh — why is the Wh wrong?
The Wh figure shown in Dell's battery report is pulled from the old cell's EEPROM stored in system memory, not measured from the new cell in real time. Until the BIOS learn cycle runs and updates that register, the number stays stale. Complete one full discharge-to-hibernate and uninterrupted recharge cycle. After that the system re-reads the cell data and the Wh figure aligns with the actual 48.84Wh rating.
New battery charges to 80% then stops — E5500 never reaches 100%
Dell BIOS on several Latitude E-series models includes a charge-limit setting that caps charging at 80% to reduce cell wear over time. This is a BIOS-controlled firmware decision, not a fault with the replacement cell. Open Dell Command Configure or go to BIOS setup under Power Management and check whether "Custom Charge" or "Primarily AC" mode is active. Switch it to "Adaptive" or "Standard" and the cell will charge to 100%.
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