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SCUD-WT-N6 Samsung Galaxy A20s Replacement Battery 3.85V 3900mAh

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From $26.99 USD $33.99
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Fits Galaxy A20s (SM-A2070) and replaces Samsung OEM battery SCUD-WT-N6.
3.85V, 3900mAh Li-Polymer cell supplies full power to display, processor, and wireless radios.
Connector slides into original battery slot with locking tab at base of device.
We ran discharge cycles on a bench Galaxy A20s — fuel gauge IC tracked voltage curve without early cutoff.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the coulomb counter recalibrate against the new cell's discharge profile before high-current 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

3.85V

Amp

3900mAh

Samsung Galaxy A20s — 3.85V Li-Polymer Replacement Battery (SCUD-WT-N6)

This is a 3.85V, 3900mAh Li-Polymer battery for the Samsung Galaxy A20s (SM-A2070), including the 2019 single and dual SIM variants. It replaces the internal cell when the original degrades, loses capacity, or fails to hold a charge. Part number SCUD-WT-N6 matches the OEM specification for this model line.

  • Galaxy A20s and SM-A2070 compatibility: The A20s series shares a common battery bay geometry, connector pinout, and BMS communication protocol across the SM-A2070 variants. This cell fits those models without modification to the flex connector or adhesive mounting points.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an SM-A2070 unit. The BMS handshake completed correctly, charge IC accepted the cell without fault codes, and voltage held steady under combined screen and modem load.
  • First-cycle fast charge lockout: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Galaxy A20s reports wrong battery percentage after a cell swap

The A20s uses a fuel gauge IC that builds its discharge model from the previous cell's charge curve. When you install a new cell, the IC still references the old calibration data. This causes the percentage readout to jump, stall, or report full charge when the cell is not actually full. One complete slow discharge-charge cycle overwrites the stored curve and syncs the counter to the new cell's real capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge IC expects — a voltage cliff caused by a mismatch between the stored discharge curve and the new cell's actual internal resistance profile. The phone interprets the voltage sag as a critical battery event and cuts power before the percentage reaches zero. Run one full uninterrupted discharge to empty, then charge to 100% without interruption. After that cycle, the IC recalibrates its cutoff reference and shutdowns at low percentage stop.

Compatible Models

Galaxy A20s SM-A2070 Galaxy A20s 2019 Galaxy A20s 2019 Dual SIM SM-A207 SM-A207F SM-A207M/DS SM-A207F/DS SM-A102J SCV49 SM-A102D SC-42A A215 SM-A215U Galaxy A21 2020 SM-A215R4 SM-A215U1 SM-A215W SM-A215P SM-A215T

Replaces Part Numbers

SCUD-WT-N6

Technical Specifications

Voltage3.85V
Amp Hours3900mAh
Capacity3900mAh
Rate15.02Wh
Net Weight56g /1.98 oz
Gross Weight91g /3.21 oz
Approximate Weight91g /3.21 oz
Dimension 87.40 x 66.00 x 3.92mm

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 A20s won't power on at all after the new battery sat in the drawer for a few months — is the battery dead?

The BMS locks the cell out when voltage drops below roughly 2.5V per cell during extended storage — this is a protection state, not permanent failure. Connect the phone to the original Samsung charger and leave it for 20–30 minutes without pressing the power button; the charge IC needs to trickle current into the cell before the BMS releases. If the charging indicator appears within that window, the cell is recovering. If nothing appears after 45 minutes on a known-working charger, measure the battery terminals — a reading below 2.0V means the cell has deep-discharged past recovery.

Fast charging stopped working on my A20s after I put in the replacement battery — the phone just charges slowly now.

Samsung's Adaptive Fast Charge protocol requires the BMS to signal readiness to the charge IC on the first cycle — some replacement cells present a high-impedance state on the first charge that the charge IC interprets as a signal to fall back to standard rate. Charge the phone once to 100% using a standard 5V charger, then disconnect and power cycle the device. On the next charge attempt with the Samsung fast charger, the BMS handshake completes correctly and full charge rate resumes.

The battery percentage on my A20s keeps jumping around — drops 10% in seconds, then climbs back up.

Erratic percentage jumps are a fuel gauge IC recalibration symptom — the coulomb counter is interpolating across a discharge curve it hasn't mapped yet for the new cell. This is not a fault with the cell itself. Charge to 100%, then discharge the phone in normal use without topping up until it shuts down from low battery, then charge to 100% in one uninterrupted session. After that single full cycle, the IC locks onto the new cell's curve and percentage readings stabilise.

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