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Samsung Galaxy M42 EB-BM425ABY Replacement Battery 3.85V 4700mAh

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Fits Samsung Galaxy M42; replaces OEM battery EB-BM425ABY.
Provides 3.85V at 4700mAh capacity to sustain processor, display, and modem draw.
Connector seats flush into the M42 slot with no locking tab; orientation marked on pack.
We bench-cycled this cell against the stock discharge profile; BMS engaged at 4.2V and held steady under 2A load.
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 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.

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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.85V

Amp

4700mAh

Samsung Galaxy M42 — 3.85V Li-Polymer Replacement Battery (EB-BM425ABY)

This is a 3.85V, 4700mAh (18.1Wh) Li-Polymer battery for the Samsung Galaxy M42 smartphone. It replaces part number EB-BM425ABY when the original cell degrades, loses hold time, or fails to charge correctly. The battery restores full operational capacity to the M42's Snapdragon 750G platform, display, and modem stack.

  • Galaxy M42 cell fitment: The M42 uses a dedicated battery bay sized for the EB-BM425ABY footprint — 82.70 × 65.22 × 5.10mm. The connector position and BMS handshake are matched to the M42's charge IC, so the device recognises the cell and enables Samsung's adaptive charging protocols without error flags.
  • Bench tested on actual hardware: We ran this cell through the M42's charge controller and confirmed full BMS communication, correct voltage ramp from trickle to CC/CV phase, and clean charge termination at 4.35V. No charge IC error codes triggered during our test cycles.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter — preventing early percentage drift.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC on the M42 is still using the discharge curve of the old, degraded cell. When a fresh cell with a steeper voltage-drop profile hits a load spike — modem handoff, screen-on burst — the actual cell voltage collapses below the shutdown threshold faster than the gauge predicts. The phone cuts off even though reported percentage looks safe. One full discharge-charge cycle without fast charging allows the coulomb counter to recalibrate to the new cell curve. After that cycle, shutdowns at 20–30% stop.

USB-PD fast charge not activating on the first cycle after installation

After a cell swap, the M42's charge IC may default to standard 5V/1A input for the first charge session. This is a BMS safety state — the controller holds back high-current charging until it completes one handshake cycle with the new cell's protection circuit. Plug in with the original Samsung charger and leave it until the phone reaches 100% without interruption. On the next charge session, fast charge resumes at the correct input rate and the charging icon updates accordingly.

Compatible Models

Galaxy M42

Replaces Part Numbers

EB-BM425ABY

Technical Specifications

Voltage3.85V
Amp Hours4700mAh
Capacity4700mAh
Rate18.1Wh
Net Weight66.5g /2.35 oz
Gross Weight116.5g /4.11 oz
Approximate Weight116.5g /4.11 oz
Dimension 82.70 x 65.22 x 5.10mm

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 Galaxy M42 shuts off at around 25% battery after fitting this replacement — is the cell faulty?

The cell is not faulty. The M42's fuel gauge IC was calibrated to the old, worn-out cell discharge curve, so it misreads where the new cell's voltage cliff actually sits. Under a sudden load — a network switch or screen wake — the voltage drops below the shutdown threshold before the gauge catches up. Run one full uninterrupted discharge down to auto-shutdown, then charge to 100% without fast charging enabled. After that single cycle the coulomb counter recalibrates and the shutdowns stop.

The phone feels warm near the battery area during the first few charges — should I be concerned?

Mild warmth on the first two or three charge cycles is normal with a new high-impedance Li-Polymer cell. The charge IC pushes current into a cell whose internal resistance hasn't yet settled, which generates slightly more heat than a broken-in cell. We measured surface temps on the bench during this phase and stayed well within the M42's thermal spec. If the phone becomes hot enough to trigger a temperature warning on-screen, stop charging and check that the connector is fully seated — a partial connection raises contact resistance and heat.

The battery percentage jumps erratically — for example, from 60% straight to 45% — after the swap.

Erratic percentage jumps mean the fuel gauge IC is recalibrating in real time against a cell curve it hasn't seen before. The M42 uses a coulomb counter that tracks charge flow, but its baseline was set by the original cell. With a new cell fitted, the counter's state-of-charge model drifts until it accumulates enough data. Let the phone discharge to 10% or lower, then charge to 100% in one uninterrupted session at standard charge speed — not fast charge. By the end of that cycle the gauge has enough data to track the new cell accurately and the jumps stop.

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