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Samsung Galaxy Xcover 4 EB-BG390BBE Replacement Battery 3.85V 2500mAh

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From $26.99 USD $33.99
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Fits Samsung Galaxy Xcover 4 models SM-G390, SM-G390F, SM-G390Y and replaces OEM battery EB-BG390BBE.
3.85V and 2500mAh means this cell delivers stable voltage under modem and screen load without the voltage cliff that causes sudden shutdowns.
Connector is a standard two-pin JST; slides into the battery slot with the contacts facing the device motherboard and locks flush against the rear housing.
Bench testing showed the BMS accepted 5V/2A input on first cycle with no fault codes; fuel gauge IC began recalibration against the new discharge curve immediately.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the coulomb counter recalibrate against the new cell's discharge profile before high-current charging.
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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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⚠️ 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

3.85V

Amp

2500mAh

Samsung Galaxy Xcover 4 — 3.85V Li-ion Replacement Battery (EB-BG390BBE)

This is a 3.85V, 2500mAh Li-ion cell that replaces the original EB-BG390BBE battery in the Samsung Galaxy Xcover 4. It fits the SM-G390, SM-G390F, and SM-G390Y variants along with additional SM-G390 sub-models. The battery slots directly into the removable-back housing and connects via the standard three-pin contact strip.

  • SM-G390 variant compatibility: All SM-G390 sub-models share the same battery bay dimensions, contact layout, and BMS handshake protocol — the fuel gauge IC communicates across the same three-pin interface regardless of regional firmware variant.
  • Bench tested on actual hardware: We ran this cell on an SM-G390F unit and confirmed the BMS accepted the new cell without fault codes, fuel gauge initialisation completed within the first charge cycle, and the charge IC stepped through trickle, CC, and CV phases correctly.
  • Fuel gauge recalibration on first use: After fitting this battery, disable fast charging in Settings and run one full discharge down to automatic shutdown, then charge uninterrupted to 100% — this gives the coulomb counter a clean baseline against the new cell's discharge curve before any high-current sessions.

Why the Xcover 4 reports wrong battery percentage after a cell swap

The Xcover 4 uses a coulomb counter that builds its discharge model against the original cell's impedance and capacity curve. When you fit a new cell, that stored model no longer matches what the hardware sees. The fuel gauge IC starts estimating from stale data, which produces percentage readings that jump or stall. One complete uninterrupted discharge-to-shutdown followed by a full charge resets the counter and anchors it to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under modem or screen load — a voltage cliff where the reported state of charge says 25% but the actual cell voltage has already fallen below the cutoff threshold the BMS enforces. Aged cells sag harder under load, but even new cells show this on first use if the fuel gauge is still running the old discharge curve. The fix is the same calibration cycle: full drain to automatic shutdown, then charge straight to 100% without interruption. After that cycle, the percentage and the real cell voltage track each other correctly.

Compatible Models

Galaxy Xcover 4 SM-G390 SM-G390F SM-G390Y SM-G390W Galaxy Xcover 4 2017 TD-LTE Galaxy Xcover 4S

Replaces Part Numbers

EB-BG390BBE EB-BG390BBEGWW

Technical Specifications

Voltage3.85V
Amp Hours2500mAh
Capacity2500mAh
Rate9.63Wh
Net Weight44g /1.55 oz
Gross Weight94g /3.32 oz
Approximate Weight94g /3.32 oz
Dimension 84.70 x 42.20 x 5.50mm

Product Highlights

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

Frequently Asked Questions

My Xcover 4 won't turn on at all after the replacement battery sat in the drawer for a few months — is the cell dead?

Probably not dead, but the BMS has tripped into lockout because the cell self-discharged below 2.5V during storage. Connect the phone to a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC will push a low trickle current to bring the cell back above the BMS re-enable threshold, after which the phone will boot normally. If the screen shows no charging indicator at all after 30 minutes on the wall adapter, try a different cable first before drawing any other conclusions.

Fast charging stopped working after I fitted this battery — the phone only charges slowly now.

On the first cycle after a cell swap, the BMS on the new cell may not immediately negotiate the Samsung Adaptive Fast Charge handshake with the charge IC. This is normal — the fuel gauge has no calibrated data yet, so the system defaults to standard 5V charging as a precaution. Complete one full discharge-to-shutdown and then charge uninterrupted to 100% using the original Samsung fast charger. After that cycle the handshake re-establishes and fast charging resumes at the correct current.

The battery percentage jumps erratically — skipping from 60% to 45% in minutes, then barely moving for an hour.

The coulomb counter is recalibrating against the new cell and the readings are unreliable until it has a full reference cycle. The counter was trained on the old cell's impedance profile, so discharge estimates are off — especially in the mid-range where cell voltage is relatively flat and small errors in the model produce large swings in reported percentage. Run one complete discharge to automatic shutdown, then charge straight to 100% without unplugging. After that single cycle the percentage display will stabilise.

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