Medion Akoya MD97199 Replacement Battery BTY-S31 14.8V 4400mAh
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Medion Akoya MD97199 Replacement Battery BTY-S31 14.8V 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.
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.
Medion Akoya MD97199 Replacement Battery BTY-S31 14.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
4400mAh
Medion Akoya MD97199 Series — 14.8V Li-Polymer Replacement Battery (BTY-S31)
This is a 14.8V, 4400mAh Li-Polymer replacement battery for the Medion Akoya MD97199, MD97201, MD97247, and MD98150 notebooks. It slots into the same bay as the original cell and uses the same OEM part numbers BTY-S31, 925T2950F, and BTY-S32. Capacity is 65.12Wh, matching the original specification.
- Akoya MD97199 series compatibility: These four Akoya models share the same battery bay dimensions, 14.8V power rail, and BMS connector pinout. The BTY-S31 part number covers all four without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an Akoya-series board. The BMS handshake completed without fault codes, and the charge controller accepted the full 4400mAh cell without triggering protection cutoff.
- Post-install calibration on Akoya notebooks: After fitting this cell, 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 typically appears after any cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The Akoya MD97199 BIOS reads health data stored in the old cell's EEPROM, not from real-time voltage measurements. When a new cell goes in, the EEPROM data no longer matches the new chemistry, and the BIOS flags it as degraded or unknown. This is not a fault with the replacement cell. Run the full discharge-to-hibernate, then charge-to-100% cycle once, and the BIOS will re-learn the new cell's capacity baseline and clear the warning.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated to the old, degraded cell. The percentage shown reflects the old cell's voltage curve, not the new one. Under combined CPU and display load, the new cell hits a voltage point the firmware incorrectly reads as near-empty and triggers an emergency shutdown. Run two full calibration cycles — discharge to hibernate-cutoff, charge to 100% uninterrupted — and the fuel gauge IC will re-map to the new cell's actual voltage range, resolving the early cutoff at 14.4V.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Medion
- Manufacturer: CS
- Series: Standard
- Color: Blue
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Akoya MD97199 shows the new battery as "0% available — plugged in charging" but the charge light is on — what's wrong?
The fuel gauge IC is reading EEPROM data from the old cell and hasn't yet mapped the new cell's voltage curve. The cell is charging normally — the percentage display is just wrong at this stage. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. After that cycle, the IC recalibrates and the percentage readout corrects itself.
Windows reports the Wh rating on this replacement as different from what the original battery showed — is the cell actually smaller?
The Wh value Windows reads comes from static EEPROM data embedded in the battery's circuit board, which may reflect a rated figure from the original OEM cell rather than the actual chemistry of the replacement. The physical cell in this battery is 65.12Wh — that is the real capacity. The EEPROM-reported figure in Windows Device Manager is a firmware artefact, not a measure of actual charge delivered. Use a calibration cycle to let the fuel gauge IC confirm real capacity from voltage data.
The Akoya notebook stops charging at exactly 80% and won't go higher — is this a fault with the replacement cell?
This is almost always a BIOS-controlled charge limit, not a cell fault. Medion Akoya notebooks running certain firmware versions activate a charge cap at 80% to reduce cell wear during mains-connected use. Check the Medion battery management utility or BIOS power settings — look for a "Battery Conservation Mode" or "Charge Limit" toggle and disable it. Once turned off, charge the battery and it will reach 100% at the normal 16.8V full-charge cutoff.
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