Lenovo ThinkPad Edge E550 Replacement Battery 45N1758 10.8V 4400mAh
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Lenovo ThinkPad Edge E550 Replacement Battery 45N1758 10.8V 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.
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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 ThinkPad Edge E550 Replacement Battery 45N1758 10.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Lenovo ThinkPad Edge E550 / E555 Series — 10.8V Li-ion Replacement Battery (45N1758)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion replacement battery for the Lenovo ThinkPad Edge E550, E550C, and E555 series notebooks. It installs directly in place of the original pack and connects via the standard ThinkPad multi-pin power and data connector. Compatible OEM part numbers include 45N1758, 45N1759, 45N1760, 45N1761, 45N1763, and 4X50G59217, among others.
- E550 / E550C / E555 platform fit: These models share the same 10.8V battery rail, identical connector pinout, and the same BMS handshake protocol across the E5xx generation — one cell fits the entire lineup regardless of minor SKU suffix differences.
- Bench tested on actual hardware: We ran this cell on an E550 unit under combined CPU and display load. The BMS held voltage above the 10.0V cutoff threshold throughout the discharge cycle and reported charge state correctly to the EC controller.
- Post-install calibration on the E550: After fitting this battery, run one full discharge to the hibernate-cutoff point, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on ThinkPad hardware.
BIOS reporting poor battery health immediately after fitting a new cell
The ThinkPad EC reads learned capacity data stored in the old cell's EEPROM. When a new cell goes in, that learned data is gone and the EC flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell — it is the EC comparing zero learned cycles against its own threshold. Run one full discharge-to-hibernate then a full uninterrupted charge. After two to three cycles the EC recalibrates and the health warning clears.
Laptop shuts off at 20–30% charge shown on screen
The fuel gauge IC on the E550 motherboard maps voltage curves from the previous cell. A fresh cell has a slightly different voltage-to-capacity slope, so the gauge reads 20–30% while the actual cell voltage is already near the low-cutoff cliff. Under full CPU plus display load, the voltage drops sharply and the EC triggers an emergency shutdown. Force a full discharge to hibernate, charge to 100% without interruption, and repeat twice. After recalibration the gauge tracks the new cell's curve accurately and the cutoff moves back to the correct threshold near 3.0V per cell.
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 ThinkPad Edge E550 show "0% available (plugged in, charging)" after fitting the new battery?
The EC cannot read a charge level from a cell with no EEPROM history, so it reports 0% until the first full cycle completes. Plug in the AC adapter and let it charge uninterrupted to 100% without using the laptop. Once the charge LED goes solid, the EC writes the first data point and the percentage display corrects itself.
The Lenovo battery gauge on the E550 is jumping between 60% and 85% randomly — what causes that?
The fuel gauge IC is still mapping its voltage-to-capacity curve against the new cell's chemistry. Until it runs two or three full discharge-and-charge cycles, the curve fit is loose and the percentage reading swings. Run two complete cycles — discharge to hibernate cutoff, then charge to 100% each time — and the gauge stabilises as the IC locks onto the new cell's actual voltage slope.
Windows shows this E550 battery as 47Wh but Lenovo Vantage shows a different Wh figure — which is correct?
Windows reads the rated Wh value stored in the battery's EEPROM (47.52Wh for this cell). Lenovo Vantage pulls its figure from the EC's learned capacity register, which starts at zero and builds up over charge cycles — so early on it will show a lower or inconsistent number. Run three full calibration cycles and the Vantage figure will converge toward the EEPROM-rated 47.52Wh as the EC updates its learned data.
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