Uniwill L50 10.8V Replacement Battery 805N00045 4400mAh
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Uniwill L50 10.8V Replacement Battery 805N00045 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.
Uniwill L50 10.8V Replacement Battery 805N00045 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Uniwill L50 Series — 10.8V Li-ion Replacement Battery (805N00045)
This is a 10.8V, 4400mAh Li-ion battery for the Uniwill L50 notebook line. It fits the L50, L50II0, L50II5, and L50RI0 among other L50 and L51 variants. Cell capacity matches the original 47.52Wh specification listed in Uniwill's OEM data.
- L50 and L51 platform compatibility: Both series share the same 3S cell configuration, connector pinout, and BMS handshake protocol. A battery carrying any of the 3S4000 or 3S4400 part numbers slots directly into either chassis without adapter or firmware change.
- Bench tested on actual hardware: We cycled this cell through charge, discharge, and BMS trip conditions on an L50 board. The protection circuit responded correctly to over-discharge and over-current events, and the SMBus communication with the motherboard stayed stable across the full charge window.
- Post-install calibration cycle: After fitting this battery, run the laptop down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The L50's BIOS reads health data from EEPROM registers that the old battery wrote over years of use. A fresh cell arrives with default register values, which the BIOS interprets as degraded or unknown. This is not a fault with the new battery. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — this triggers the learn cycle and overwrites the stale EEPROM reference. After one or two cycles the health status corrects itself.
Laptop shuts down abruptly at 20–30% charge shown on the gauge
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The gauge thinks 20% capacity remains, but the new cell's actual open-circuit voltage at that point sits above what the old degraded cell could sustain. Under full CPU and display load, the voltage drops fast, the BMS trips the output, and the laptop cuts off without warning. Force a full discharge to hibernate at the lowest screen brightness setting to let the IC map the new cell's real low-voltage floor. After two full cycles the cutoff point stabilises at or below 5% shown.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Uniwill
- 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
The Uniwill L50 shows the battery as "0% available (plugged in, not charging)" right after I installed this replacement — is the cell dead?
The cell is not dead. The L50's SMBus fuel gauge IC is still referencing the old battery's EEPROM data and reports zero until it maps the new cell. Remove the AC adapter, let the laptop run on battery until it hibernates, then plug in and charge straight to 100% without interruption. After that first full cycle the gauge resets and reads accurately.
My L50 shuts off with no warning even though Windows shows around 25% battery left — what's causing that?
The fuel gauge IC calibrated itself to the old cell's voltage curve, so it reads 25% at a voltage point where the new cell actually has very little capacity left under load. When the CPU and display draw spikes, the cell voltage drops below the BMS cutoff threshold before the gauge catches up. Run two full discharge-to-hibernate cycles at low screen brightness to let the IC remap the new cell's discharge curve — the abrupt cutoff point will shift below 5% shown.
System information shows the wrong Wh rating for this battery — it lists a lower value than the 47.52Wh spec on the product page. Is the capacity actually lower?
The Wh figure in system info is pulled from the battery's EEPROM, which stores the rated value written at manufacture time. Different OEM part variants in the L50 family used slightly different register values even at the same physical capacity. The actual electrochemical capacity of the cell matches the 4400mAh / 47.52Wh specification. After two full charge-discharge cycles, check the "full charge capacity" field in a tool like HWiNFO or BatteryInfoView — it will reflect the real cell capacity, not the EEPROM snapshot.
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