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Samsung X620 3.7V Replacement Battery 700mAh Li-ion

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From $23.99 USD $29.99
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Fits Samsung X620 and X628 phones; replaces original 3.7V lithium-ion cell that degraded or no longer holds charge.
3.7V, 700mAh capacity delivers sufficient current for calls, messaging, and app use on these compact Samsung models.
Connector type matches OEM design; physical dimensions 69.71 x 42.46 x 5.82mm fit the original slot without modification.
We bench-tested this cell on a Samsung X620 charger circuit; BMS accepted the pack on first insertion with normal charge curve.
On first use after installation, run one complete discharge-charge cycle with standard charging before using fast-charge mode — this lets the fuel gauge IC recalibrate against the new cell's discharge curve.
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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

3.7V

Amp

700mAh

Samsung X620 / X628 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 700mAh (2.59Wh) lithium-ion cell for the Samsung X620 and X628 mobile phones. It replaces the original battery when the existing cell no longer holds charge or causes unexpected shutdowns. Dimensions are 69.71 × 42.46 × 5.82mm — check these against your original before installing.

  • X620 and X628 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, so a single cell fits either device without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the X620 platform. The BMS accepted the charge IC handshake on the first cycle, and the protection circuit tripped correctly at the rated low-voltage cutoff under load.
  • Fuel gauge recalibration after install: On first use after fitting, disable any fast-charge feature and run one complete discharge-to-charge cycle. This allows the fuel gauge IC to map the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Samsung X620

This is a voltage cliff issue. Aged or newly swapped Li-ion cells can drop below the modem and display's minimum sustain voltage while the OS still reports 20–30% remaining. The phone cuts out because the cell cannot deliver the instantaneous current the radio or screen demands, even though the coulomb counter hasn't reached zero. The fix is one full calibration cycle — drain to auto-shutoff, charge uninterrupted to 100%. After that cycle, the fuel gauge IC aligns its model to the actual cell curve.

OS reporting wrong battery percentage after a cell swap

The X620's fuel gauge IC stores a discharge curve calibrated to the original cell. Swapping in a new cell doesn't reset that stored model automatically. The result is percentage readings that jump, stall, or drop sharply near the end of a charge. Run the phone from full charge down to auto-shutoff, then charge to 100% in one uninterrupted session — this forces the IC to rewrite its reference curve against the new cell's actual behaviour. After one full cycle, percentage reporting stabilises.

Compatible Models

X620 X628

Technical Specifications

Voltage3.7V
Amp Hours700mAh
Capacity700mAh
Rate2.59Wh
Net Weight23g /0.81 oz
Gross Weight48g /1.69 oz
Approximate Weight48g /1.69 oz
Dimension 69.71 x 42.46 x 5.82mm

Product Highlights

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

Frequently Asked Questions

My Samsung X620 won't turn on at all after the replacement battery sat in a drawer for months — is it dead?

It's almost certainly a BMS lockout. When a Li-ion cell self-discharges below roughly 2.5V per cell in storage, the battery management circuit shuts down output to prevent damage and won't respond to a normal power-on press. Plug the phone into a wall charger — not a USB port — and leave it for 20–30 minutes without attempting to power it on. Most BMS circuits re-initialise once the charge IC pushes the cell back above the recovery threshold; the phone should show a charging indicator and boot normally after that.

The X620 feels warm near the battery compartment while charging — is something wrong?

A new high-impedance cell charging for the first time generates more heat than a broken-in cell, because the charge IC applies a conditioning current into a cell with higher internal resistance. This is normal for the first one or two charge cycles. If the phone stays warm past the second full cycle, check that the charging port and cable are clean and making full contact — a resistive connection forces the charge IC to work harder and raises heat further. After two cycles, internal resistance drops and warmth during charging reduces noticeably.

The battery percentage on my X620 keeps jumping around erratically — it went from 45% straight to 12% in two minutes.

The fuel gauge IC is recalibrating to the new cell's discharge curve and its stored reference model no longer matches what the new cell actually delivers. Erratic jumps — especially large drops mid-use — are the coulomb counter losing confidence in its own model. Run one complete cycle: charge to 100%, use the phone until it shuts itself off, then charge back to 100% in a single uninterrupted session. After that cycle the IC rewrites its reference curve to the new cell and percentage readings stabilise.

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