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Samsung Galaxy Note 20 Ultra EB-BN985ABY Replacement Battery 3.87V 4200mAh

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From $26.99 USD $33.99
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Fits Galaxy Note 20 Ultra and Note 20 Ultra 5G models; replaces Samsung EB-BN985ABY.
3.87V, 4200mAh lithium-polymer cell restores full charge capacity to the original pack.
Connector seats flush into the battery slot with no modifications to housing required.
We bench-tested the pack at 2A discharge; BMS regulated voltage stable across load transitions.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell discharge curve before high-current charging resumes.
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

3.87V

Amp

4200mAh

Samsung Galaxy Note 20 Ultra — 3.87V Li-Polymer Replacement Battery (EB-BN985ABY)

This is a 3.87V, 4200mAh (16.25Wh) Li-Polymer replacement battery for the Samsung Galaxy Note 20 Ultra and Note 20 Ultra 5G. It fits SM-N985T, SM-N985, and 18 additional regional variants that share the EB-BN985ABY cell specification. OEM part number GH82-23333A covers the same cell across Samsung's official service assembly.

  • Note 20 Ultra and 5G variant compatibility: The 4G and 5G models share the same battery bay dimensions, connector pinout, and BMS communication protocol. Samsung used one cell platform across both SKUs, so the EB-BN985ABY fits every regional build — Snapdragon and Exynos included.
  • Bench tested on actual hardware: We ran this cell on an SM-N985 unit and confirmed the BMS handshake completed within one charge cycle. The protection circuit tripped correctly at voltage floor and ceiling, and the charge IC accepted both standard and fast-charge current levels after the second cycle.
  • Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.

Why the Note 20 Ultra reports wrong battery percentage after a cell swap

The Galaxy Note 20 Ultra uses a coulomb counter integrated into the fuel gauge IC to track charge state. When the original cell is replaced, the IC still holds the old cell's charge curve in memory. It maps voltage readings against a curve that no longer matches, producing percentage figures that drift — often optimistic in the mid-range and suddenly dropping near 20%. One full slow charge-discharge cycle rewrites the reference curve. After that cycle, percentage reporting stabilises and the OS reads the new cell accurately.

Sudden shutdown at 20–30% after replacement

This is a voltage cliff issue, not a capacity problem. Under high-draw loads — 5G modem, high-refresh display, or simultaneous GPS — cell voltage drops sharply below the BMS cutoff threshold before the percentage display catches up. It happens most on replacement cells in the first few cycles because the fuel gauge IC has not yet mapped the new cell's voltage-to-capacity curve. Run two full discharge cycles without fast charging and the shutdowns will stop. If the phone still shuts down at 25%, check that cell voltage at that point is above 3.5V with a USB voltage meter on charge — below that indicates a cell fault.

Compatible Models

Galaxy Note 20 Ultra Note 20 Ultra 5G SM-N985T SM-N985 SM-N986N SM-N986W SM-N986U SM-N986V SM-N986C SGH-N219 M-N986D Galaxy Note 20 Ultra UW 5G SC-53A SGH-N323 SM-N986J SCG06 SM-N986U1 SM-N986P SM-N986A SM-N9860 SM-N985F/DS SM-N986B/DS

Replaces Part Numbers

EB-BN985ABY GH82-23333A

Technical Specifications

Voltage3.87V
Amp Hours4200mAh
Capacity4200mAh
Rate16.25Wh
Net Weight58g /2.05 oz
Gross Weight83g /2.93 oz
Approximate Weight83g /2.93 oz
Dimension 72.40 x 59.60 x 5.40mm

Product Highlights

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

Frequently Asked Questions

USB-PD fast charging isn't working on the new battery — it just trickle charges. What's wrong?

On the first cycle after a cell swap, the charge IC on the Note 20 Ultra sometimes does not negotiate the full fast-charge current with an uncalibrated BMS. This is not a defect — the protection circuit is being conservative until it has one full baseline cycle to work from. Run one complete slow charge to 100% and discharge to below 15%, then reconnect the fast charger. Fast charging should re-engage normally at that point.

The phone gets noticeably warm near the battery during the first few charges after replacement — is the cell faulty?

A new Li-Polymer cell has higher internal impedance than a run-in cell. During the first two to three charge cycles, the charge IC delivers current into a cell with slightly elevated resistance, which generates more heat than you would see on a broken-in cell. Surface warmth in the first few cycles is normal. If the back of the phone becomes hot to the touch — above what you can comfortably hold — stop the charge and check that the connector is fully seated, as a partial connection increases contact resistance.

The Note 20 Ultra won't power on at all after the new battery sat in a drawer for a few months before installation — is it dead?

Li-Polymer cells self-discharge in storage. If the cell dropped below approximately 2.5V per cell during that time, the BMS enters lockout mode and blocks all current flow to protect the cell from damage. Connect the phone to its original Samsung wall adapter and leave it for 30–45 minutes without pressing any buttons — the charge IC will trickle current into the cell at a safe rate until voltage rises above the BMS re-enable threshold. Once the phone shows the low-battery boot screen, the BMS has cleared and normal charging resumes.

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