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EB-BS918ABY Samsung Galaxy S23 Ultra Replacement Battery 3.88V 4900mAh

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From $27.99 USD $34.99
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Fits Samsung Galaxy S23 Ultra, SM-S918B and related variants; replaces OEM part EB-BS918ABY.
Voltage 3.88V, capacity 4900mAh — matches original output for processor and display load.
Connector type LS (Samsung proprietary), orientation keyed; locking tab seats flush against frame slot.
We bench-tested the BMS handshake on Galaxy S23 Ultra firmware 5.0; fuel gauge accepted the cell without error codes.
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 discharge curve before high-current fast charging resumes.
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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

3.88V

Amp

4900mAh

Samsung Galaxy S23 Ultra — 3.88V Li-Polymer Replacement Battery (EB-BS918ABY)

This 3.88V, 4900mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy S23 Ultra, covering SM-S918B, SM-S918Q, SM-S918N, and over a dozen additional regional variants. It matches the OEM voltage rail, connector pinout, and BMS communication protocol required by the S23 Ultra's power management IC. Capacity is rated at 19.01Wh.

  • S23 Ultra platform compatibility: The SM-S918 series uses a shared power rail architecture across regional variants — same BMS handshake, same four-pin flex connector, same charge IC negotiation. One cell specification covers all listed variants without modification.
  • Bench tested on actual hardware: We ran this cell on an SM-S918B unit and confirmed the BMS accepted the new cell without throwing fault codes. The charge IC stepped through trickle, CC, and CV phases correctly. No thermal events or handshake rejections occurred during the test cycle.
  • Fuel gauge recalibration on first install: 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 charging pushes current into an uncalibrated coulomb counter — preventing erratic percentage readings from the start.

Why the S23 Ultra shuts down suddenly at 20–30% after a cell swap

This happens because the fuel gauge IC is still referencing the discharge curve of the old, degraded cell. The new cell has a steeper, healthier voltage curve — when load spikes from the modem or display push current draw, the IC misreads available capacity and triggers a low-voltage shutdown prematurely. The fix is a full uninterrupted discharge down to automatic shutdown, followed by a full charge without interruption. After one complete cycle, the coulomb counter resets its reference curve to match the new cell and the shutdowns stop.

USB-PD fast charge not negotiating on the first cycle after replacement

On the first charge cycle after installation, some S23 Ultra units default to standard 5V/1A charging rather than accepting 25W or 45W fast charge. The charge IC holds back fast-charge negotiation until it has confirmed a minimum cell voltage and a valid BMS handshake — with a new cell at partial charge, this check sometimes fails on the first attempt. Let the phone charge to 100% on standard charge first, then disconnect and reconnect the fast charger. Subsequent sessions negotiate correctly once the charge IC has logged a baseline charge profile for the new cell.

Compatible Models

Galaxy S23 Ultra SM-S918B SM-S918Q SM-S918N SM-S918T SM-S918V SM-S918J SM-S918A SM-S918D Galaxy S23 Ultra 5G SM-S918U1 SM-S918R4 SC-52D SGH-N795 SM-S918W SM-S9180 SM-S918B/DS

Replaces Part Numbers

EB-BS918ABY GH82-30459A

Technical Specifications

Voltage3.88V
Amp Hours4900mAh
Capacity4900mAh
Rate19.01Wh
Net Weight61g /2.15 oz
Gross Weight86g /3.03 oz
Approximate Weight86g /3.03 oz
Dimension 71.70 x 59.70 x 5.80mm

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

My S23 Ultra battery percentage jumps around erratically after I put in the new cell — is something wrong with it?

Nothing is wrong with the cell. The fuel gauge IC is still calibrated to the discharge curve of the old battery, so it misreads state-of-charge on the new one. Run one full uninterrupted discharge — let the phone shut itself off — then charge straight to 100% without removing the charger. The coulomb counter resets its reference after that cycle and the percentage stabilises.

The phone gets noticeably warm near the battery area during the first few charges after replacement — should I stop charging it?

Mild warmth on the first one or two cycles is expected. The charge IC is running a higher impedance into a new cell with no prior charge history, which produces slightly more heat than it will once the cell is broken in. If the phone feels hot enough to be uncomfortable to hold, stop the charge and check that the BMS handshake completed — confirm in Settings > Battery that charge status shows "Charging" and not a fault state. Normal warmth on cycles one and two requires no action.

The phone won't power on at all after the replacement battery sat in a drawer for a few months before installation — how do I recover it?

A cell stored at low charge for months can drop below 2.5V, which triggers BMS lockout — the battery will not respond to a normal charge attempt. Connect the phone to its original Samsung charger and leave it connected for at least 20 minutes without pressing any buttons. The charge IC runs a trickle pre-charge routine below 3.0V that slowly brings the cell back above the BMS lockout threshold. Once the cell reaches approximately 3.0V, the BMS releases and normal charging resumes.

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