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Dell Latitude 12 5285 1WND8 Replacement Battery 11.4V 2550mAh

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From $57.99 USD $71.99
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Fits Dell Latitude 12 5285 and replaces OEM part number 1WND8.
11.4V and 2550mAh capacity sustains this ultrabook through extended work away from power outlets.
Connector seats flush into the battery slot with a single locking tab — orient the pack so the tab engages fully before sliding.
We bench tested this cell on the Latitude 5285 mainboard; BMS accepted the handshake on first insert and cycled voltage clean under sustained CPU load.
After installation, discharge fully to sleep mode, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false low-health warnings.
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.

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🔹 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.

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⚠️ 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

11.4V

Amp

2550mAh

Dell Latitude 12 5285 — 11.4V Li-Polymer Replacement Battery (1WND8)

This is an 11.4V, 2550mAh (29.07Wh) Li-Polymer battery for the Dell Latitude 12 5285 2-in-1 ultrabook. It replaces OEM part number 1WND8 directly. The 5285 uses a slim Li-Polymer cell to stay within its compact chassis — standard Li-ion cylindrical cells do not fit this slot.

  • Latitude 5285 platform fit: The 5285 runs an 11.4V three-cell Li-Polymer pack with a specific SMBus connector and BMS handshake. The BIOS authenticates the battery over SMBus before enabling charge. A cell that does not match the expected voltage rail or communication protocol will show as unrecognised immediately on boot.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 5285 platform. The BMS reported state-of-charge correctly, the BIOS accepted the SMBus handshake without flags, and charge tapered cleanly at full capacity.
  • First-cycle learn reset on the 5285: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The BIOS battery learn cycle needs this to calibrate the fuel gauge IC against the new cell. Skipping it causes the health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after installing a new cell

The Latitude 5285 BIOS reads health data from the cell's EEPROM on every boot. When a new cell is fitted, the EEPROM contains factory default values that do not match the BIOS's stored discharge history. The system flags this mismatch as degraded health — even on a brand-new cell. Running one complete discharge-to-hibernate then an uninterrupted full charge lets the BIOS overwrite the old data and recalculate from the new cell's baseline.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC still maps voltage curves from the old, degraded cell. Under combined CPU and display load, the new cell's actual voltage drop looks like a cliff to the old calibration data, and the system cuts power before the gauge reaches 0%. It is a calibration mismatch, not a fault with the new cell. Run two full discharge-to-hibernate and full recharge cycles to reset the fuel gauge — after that, the shutdown point will move back to the correct voltage floor near 10.2V.

Compatible Models

Latitude 12 5285 Latitude 5285

Replaces Part Numbers

1WND8

Technical Specifications

Voltage11.4V
Amp Hours2550mAh
Capacity2550mAh
Rate29.07Wh
Net Weight119g /4.20 oz
Gross Weight259g /9.14 oz
Approximate Weight259g /9.14 oz
Dimension 192.36 x 93.35 x 6.00mm

Product Highlights

  • Brand: Dell
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

Dell BIOS says "battery not detected" or shows 0% right after I installed the new 1WND8 — is the cell dead?

Not necessarily. The Latitude 5285 BIOS authenticates the battery over SMBus before it will read charge state. If the SMBus handshake times out — often caused by reseating the connector only partially — the BIOS reports the cell as absent or at 0%. Shut down completely, remove the battery, reseat the connector until it clicks firm, then power on. If the BIOS still shows 0% after a firm reseat, connect AC power and let the cell accept a charge for 15 minutes before booting again.

The system info screen shows the wrong Wh rating — it says something different from 29.07Wh. Is the battery mislabelled?

The Wh figure shown in Dell's system info pulls from the EEPROM on the cell, which stores the OEM-rated value at manufacture. That figure may differ slightly from the calculated 29.07Wh (11.4V × 2550mAh) due to rounding or OEM firmware versioning. The actual usable capacity is correct — the EEPROM value is a label, not a live measurement. Run the battery through one full discharge and recharge cycle; the OS fuel gauge will recalibrate against the real cell chemistry and the reported figure will stabilise.

New battery charges to 80% then stops — the charge light goes solid and nothing moves for hours.

The Latitude 5285 has a BIOS-controlled charge limit called "Primary AC Use" or "Custom Charge" that caps charging at 80% when enabled. This is a firmware setting, not a fault with the cell. Go to Dell BIOS (F2 at POST) → Power Management → Primary Battery Charge Configuration and switch it from "Primarily AC" or "Custom" to "Standard." After saving and rebooting, the battery will charge to 100%.

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Dell Latitude 12 5285 Replacement Battery, 11.4V, 2550mAh, Li-Polymer 1

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