Gateway UM09E36 Replacement Battery 10.8V 4400mAh Li-ion
This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.
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Gateway UM09E36 Replacement Battery 10.8V 4400mAh Li-ion - 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.
Gateway UM09E36 Replacement Battery 10.8V 4400mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Gateway LT22 Series — 10.8V Li-ion Replacement Battery (UM09E36)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Gateway LT22, LT2203, LT2206H, and LT2207H netbooks. It replaces OEM part numbers UM09E36, UM09E51, UM09E56, UM09E78, UM09E32, CGR-8/6P3, 3ICR18/65-2, and 3ICR19/66-2. If the original cell is degraded, swollen, or dead, this restores full battery function to the LT22 platform.
- LT22 platform compatibility: The LT2203, LT2206H, and LT2207H all share the same battery bay geometry, connector pinout, and BMS handshake protocol as the base LT22. One cell fits the entire sub-series without modification.
- Bench tested on actual hardware: We cycled this cell on an LT22 unit. The BMS initialised correctly, the OS recognised the pack, and charge termination triggered at full capacity without false cutoff.
- Post-swap calibration: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on first boot after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The LT22 BIOS reads health data from EEPROM registers written by the original cell during its service life. A new cell ships with blank or default EEPROM values, so the BIOS flags it as degraded or unknown — this is a data mismatch, not a fault with the replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS enough cycle data to overwrite the stale registers. After two or three calibration cycles, the health indicator normalises. If it persists beyond three cycles, confirm firmware is up to date in the Gateway BIOS utility.
LT22 shutting down at 20–30% charge shown on screen
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 system hits what looks like a voltage cliff and shuts down before the gauge reaches zero. The fix is a full calibration cycle: use the netbook normally until it hibernates on its own, then charge to 100% without interruption. Repeat twice. By the third cycle the fuel gauge IC has mapped the new cell's discharge curve and the shutdowns stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Gateway
- 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 Gateway LT22 shows the battery as 0% or "unknown" right after I put in the new cell — is the battery dead?
No — the LT22 BIOS is reading stale EEPROM data from the old cell and hasn't yet written new values against the replacement. Fully discharge the netbook until it hibernates on its own, then charge uninterrupted to 100%. After one complete cycle the BIOS registers the new pack and the readout corrects itself.
The fuel gauge on my LT22 is all over the place for the first few days — jumping from 60% to 15% without warning. What's causing it?
The fuel gauge IC uses a stored discharge model built from your old cell's chemistry profile. A new cell has a different voltage curve, so the estimates are wrong until the IC recalibrates against real charge and discharge data. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. The gauge stabilises by the third cycle.
System info on my LT22 shows the wrong Wh rating for the new battery — lower than the 47.52Wh on the label. Is it mislabelled?
The Wh figure in system info is pulled from the cell's EEPROM, which stores the manufacturer-rated value at pack assembly. That number can differ slightly from the chemistry-actual figure we measure on the bench. The cell itself delivers the correct 47.52Wh of usable capacity — confirm by running a full discharge cycle and checking that runtime matches your expectations before assuming a fault.
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