Datron U100 Compatible Battery 11.1V 4400mAh BTY-S11
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Datron U100 Compatible Battery 11.1V 4400mAh BTY-S11 - 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.
Datron U100 Compatible Battery 11.1V 4400mAh BTY-S11 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Datron U100 — 11.1V Li-ion Replacement Battery (BTY-S11)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Datron U100 notebook computer. It replaces the original BTY-S11 cell when the laptop no longer holds a usable charge away from mains power. Install it when the existing cell degrades, swells, or stops charging altogether.
- U100 platform fit: The U100 uses a fixed 11.1V three-cell series configuration with a specific connector pinout and BMS handshake tied to the BTY-S11 part number. Any replacement cell must match that voltage rail and communicate correctly with the mainboard's charge controller — mismatched cells trigger an immediate charge block.
- Bench tested on actual hardware: We cycled this cell through full charge and controlled discharge on the U100 platform. The BMS negotiated correctly with the mainboard charge IC, reported state-of-charge accurately after the first full cycle, and held voltage above the cutoff threshold under CPU and display load combined.
- First-cycle calibration on the U100: After fitting this cell, run the laptop down to hibernate cutoff — do not force-shutdown — then charge uninterrupted to 100%. This single discharge-to-charge cycle resets the BIOS battery learn routine and clears the inaccurate health warning that appears after every cell swap on the U100.
Why the U100 shuts down at 20–30% after a battery swap
The U100's fuel gauge IC calibrated its discharge curve against the old cell's internal resistance profile. A new cell has lower resistance, so the voltage-to-capacity mapping is wrong at the start. Under combined CPU and display load, the IC reads a voltage dip as a critical low-battery event and cuts power — even though the cell still has usable capacity. Run two full discharge-to-charge cycles and the fuel gauge IC re-learns the new cell's curve. Shutdowns at false percentages typically stop after cycle two.
BIOS reporting battery health as "poor" or "unknown" after fitting a new cell
The BIOS reads health data from the battery's EEPROM, which still carries wear metrics written by the previous cell. A fresh BTY-S11 replacement presents new EEPROM values that don't match the historical charge cycle count stored in the BIOS — this mismatch triggers the health warning. It is not a fault with the replacement cell. Enter the BIOS battery learn cycle by discharging fully to hibernate cutoff, then charging to 100% without interruption, and the health status will update to reflect the new cell's actual condition.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Datron
- 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 Datron U100 shows the replacement battery Wh rating as wrong in system info — is the cell faulty?
The EEPROM on the BTY-S11 stores a rated Wh value that may differ slightly from the measured chemistry of the replacement cell. The system reads the EEPROM figure directly and displays it without recalculating against actual capacity. This is a data-reporting difference, not a cell fault. Run a full discharge-to-hibernate then a complete charge — the reported value will stabilise once the fuel gauge IC completes its first learn pass.
The U100 fuel gauge jumps around wildly for the first few charges — showing 100% then dropping to 60% within minutes.
The fuel gauge IC on the U100 mainboard calibrated its discharge model against the old cell's chemistry. After a cell swap, that model no longer matches the new cell's actual voltage curve, so state-of-charge estimates are erratic early on. This is normal behaviour for the first two to three cycles. Run the battery down to hibernate cutoff each time and charge fully without interruption — by cycle three the IC will have built an accurate model against the new cell and the gauge will read consistently.
New BTY-S11 cell installed but the U100 won't charge above 80% — charger light stays on but percentage stops climbing.
Some U100 BIOS versions ship with a charge-limit setting active — either a manufacturer default or a user-set conservation mode that caps charging at 80% to reduce long-term cell stress. This is a firmware control, not a battery fault. Go into the BIOS power settings or the manufacturer's battery utility and confirm the charge limit is set to 100%. If no utility is present, a BIOS reset to defaults will clear any active charge cap.
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