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SC-02B Compatible Battery 3.7V 1550mAh Li-ion

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From $27.99 USD $34.99
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Fits Samsung Galaxy S SC-02B smartphone; replaces original OEM battery pack.
3.7V, 1550mAh Li-ion cell delivers 5.74Wh to power display, processor, and modem.
Connector slides vertically into battery slot; locking tab secures pack against spring contact.
Bench testing showed BMS accepted charge at 0.5A initial current; fuel gauge IC initialized on first full cycle.
On first use after installation, complete one full discharge-charge cycle before heavy load — the coulomb counter needs to recalibrate against this 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.

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

Voltage

3.7V

Amp

1550mAh

NTT DoCoMo Galaxy S (SC-02B) — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1550mAh Li-ion replacement battery for the Samsung Galaxy S SC-02B, the NTT DoCoMo variant sold in Japan. It fits the original 2010 SC-02B handset and restores power capacity when the original cell has degraded. Dimensions are 51.00 × 50.50 × 5.50mm — confirm these against your existing battery before installing.

  • SC-02B platform fit: The SC-02B shares Samsung's original Galaxy S battery bay and connector pinout. This cell matches that footprint and voltage rail, so the phone's charge IC can communicate with the BMS without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SC-02B platform. The BMS responded correctly to the charge IC — no false cutoff, no thermal event at standard 1A input.
  • Fuel gauge recalibration after swap: On first use, let the battery drain fully to auto-shutdown, then charge uninterrupted to 100% before use. This gives the SC-02B's fuel gauge IC one clean reference cycle against the new cell's actual discharge curve.

Why the SC-02B reports wrong percentage after a cell swap

The SC-02B uses a coulomb counter that calibrates against the original cell's discharge curve stored in memory. A new cell has a different internal resistance profile, so the counter's stored reference is immediately out of sync. The phone may show 30% when the cell is actually near empty, or report 100% well before charging completes. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the reference and brings percentage reporting back in line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically when the modem fires at full power or the display peaks brightness — even though the fuel gauge still shows charge remaining. The SC-02B's BMS triggers a hard cutoff the moment cell voltage falls below its minimum threshold, regardless of what percentage the OS is displaying. It is a voltage cliff, not a capacity problem. After one full recalibration cycle, the fuel gauge catches up to the real voltage curve and early shutdowns stop occurring.

Compatible Models

Galaxy S

Replaces Part Numbers

SC-02B

Technical Specifications

Voltage3.7V
Amp Hours1550mAh
Capacity1550mAh
Rate5.74Wh
Net Weight33.4g /1.18 oz
Gross Weight58g /2.05 oz
Approximate Weight58g /2.05 oz
Dimension 51.00 x 50.50 x 5.50mm

Product Highlights

  • Brand: NTT DoCoMo
  • 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 SC-02B won't turn on at all after the new battery sat in a drawer for a few months — is it dead?

The BMS locks out when cell voltage drops below roughly 2.5V, which happens during extended storage at partial charge. Connect the phone to a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. Once the charge IC pushes enough current to lift the cell above the BMS recovery threshold, the phone will boot normally.

The percentage on my SC-02B is jumping around erratically — sometimes it gains 10% in seconds without charging.

The fuel gauge IC is recalibrating against the new cell's discharge curve and has not yet built a stable reference. This is normal for the first few cycles after a cell swap. Run the battery from 100% down to automatic shutdown twice, with a full uninterrupted charge between each cycle, and the coulomb counter will stabilise.

Fast charging stopped working after I fitted this battery — my charger worked fine with the old cell.

The charge IC on the SC-02B negotiates charging current based on the BMS response it receives from the installed cell. On the first cycle with a new cell, the IC often defaults to a lower current rate until it confirms cell impedance is within range. Charge the battery fully once at standard rate, then disconnect and reconnect your charger — the IC re-initiates the handshake and should restore full charge current on the second cycle.

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