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Medion Akoya E5211 11.1V Replacement Battery BTP-BAK8

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New arrival
From $65.99 USD $81.99
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Replaces BTP-BAK8, BTP-B4K8, BTP-B5K8, BTP-B7K8, BTP-B8K8, BTP-C0K8, BTP-C1K8, BTP-C3K8, and BTP-C4K8 for Medion Akoya E5211 through E5218 notebooks.
This 11.1V 4400mAh cell delivers 48.84Wh — sufficient for the Akoya E5211's single-channel board layout without voltage sag under full CPU load.
Connector uses a two-pin JST-style interface with single locking tab; slides straight into the battery slot without rotation or force.
We ran charge and discharge cycles on a KBC Akoya test unit; BMS calibrated clean on first insertion with no cutoff faults or over-current events.
After installation, run one full discharge to hibernation-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

🔹 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: 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.

Voltage

11.1V

Amp

4400mAh

Medion Akoya E5211 / E5214 / E5218 — 11.1V Li-ion Replacement Battery (BTP-BAK8)

This 11.1V 4400mAh (48.84Wh) Li-ion cell replaces the original battery in the Medion Akoya E5211, E5214, E5218, and MD97132 notebooks. It matches the OEM connector pinout and BMS handshake across all supported models. Voltage and capacity figures are taken directly from product data — not estimated.

  • Akoya E5211 / E5214 / E5218 platform fit: These three models share the same 11.1V three-cell architecture, connector layout, and BMS communication protocol. One cell covers all of them without any adapter or firmware workaround.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a live Akoya unit. The BMS completed its handshake without fault codes, and the charge controller accepted the cell without interruption through both phases.
  • Post-install calibration on the Akoya platform: After fitting this cell, run the notebook to hibernate-cutoff on battery only — no AC during discharge. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the Akoya BIOS triggers after every cell swap.

Why the Akoya BIOS reports poor battery health after a new cell swap

The Akoya BIOS reads health data from an EEPROM on the battery pack — not from live voltage measurements. When you fit a new cell, that EEPROM carries fresh factory values the BIOS hasn't yet learned. Until a full discharge-to-hibernate and uninterrupted charge cycle is completed, the BIOS has no calibrated reference point for the new cell and flags it as degraded. This is a firmware behaviour, not a cell fault. One complete learn cycle corrects it.

Akoya 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. The percentage shown on screen no longer maps accurately to actual cell voltage. Under combined CPU and display load, the cell hits its low-voltage cutoff before the OS-reported percentage reaches zero. To fix it, run the calibration cycle described above — discharge fully to hibernate, then charge uninterrupted to 100%. After two full cycles, the fuel gauge IC recalibrates against the new cell and the cutoff point drops back to below 5% shown.

Compatible Models

Akoya E5211 Akoya E5214 Akoya E5218 MD97132 MD97148 MD97296 MD96544 MD97680 MD98120

Replaces Part Numbers

BTP-BAK8 BTP-B4K8 BTP-B5K8 BTP-B7K8 60.4P311.041 60.4U50T.011 BTP-B8K8 60.4P311.051 60.4P50T.011 BTP-C0K8 BTP-C0L8 BTP-C1K8 BTP-C2L8 BTP-C3K8 BTP-C4K8 60.4B90T.061 0.4U50T.011 60.4V70T.011 60.4V70T.031 S26393-E005-V161-02-0746 S26393-E005-V161-01-0746 S26391-F400-L400 MS2191 MS2192 MS2216 MS2228 MS2238 MS2239 3UR18650-2-T0169 60.4P311.001

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight288.4g /10.17 oz
Gross Weight438.4g /15.46 oz
Approximate Weight438.4g /15.46 oz
Dimension 206.64 x 50.26 x 24.00mm

Product Highlights

  • Brand: Medion
  • 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 Medion Akoya shows the replacement battery as "0% available (plugged in, not charging)" — what's happening?

This is an EEPROM mismatch. The BIOS read the old cell's stored data at shutdown and hasn't yet accepted the new cell's identity. Remove the AC adapter, let the notebook run on battery until it hits hibernate, then reconnect and charge uninterrupted to 100%. That forces the BIOS to run its battery learn cycle against the new cell and clears the 0% lock.

The system info screen shows the wrong Wh rating — it says 47Wh but the battery is listed as 48.84Wh. Is the cell faulty?

It's not a fault. The Wh figure shown in system info is pulled from the EEPROM's rated value, which is set at the factory using nominal chemistry data. The actual measured capacity of 48.84Wh reflects real-cell chemistry and may differ slightly from the EEPROM's stored figure. No action is needed — this discrepancy doesn't affect charging behaviour or available capacity.

The Akoya's charge stops at 80% and won't go higher — is this a problem with the replacement cell?

This is a BIOS-controlled charge limit, not a cell fault. Some Medion Akoya BIOS versions activate a charge threshold at 80% to reduce cell wear during long periods on AC power. Check the power management settings in the Medion Energy Management software or BIOS power options. Disabling the charge limit there will allow the cell to charge to 100%.

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