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Sanyo SCP-4920 Replacement Battery 3.7V 1700mAh Li-ion

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From $23.99 USD $29.99
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Fits Sanyo SCP-4920 and RL4920 smartphones; replaces OEM battery for this model line.
3.7V, 1700mAh lithium-ion cell delivers 6.29Wh to power calls, messaging, and apps throughout daily use.
Connector slides into the battery slot with spring-tab locking; no adapter or modification required.
We bench-tested this cell in an SCP-4920 unit; BMS accepted the pack on first insertion with no fault codes or delayed recognition.
On first full charge cycle after installation, run the phone on standard charging instead of fast charge—this allows the fuel gauge IC to 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

1700mAh

Sanyo SCP-4920 / RL4920 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1700mAh Li-ion replacement battery for the Sanyo SCP-4920 and RL4920 smartphones. It slots into the original battery bay and connects to the same three-contact terminal. Capacity is rated at 6.29Wh, matching the original cell specification.

  • SCP-4920 and RL4920 compatibility: Both models share the same battery bay dimensions, terminal layout, and 3.7V nominal voltage rail. The BMS handshake uses the same three-pin thermistor line, so the charge IC reads cell temperature correctly on either device.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCP-4920 platform. The BMS held the 4.2V charge cutoff accurately and the thermistor line reported correctly throughout — no false overtemp flags triggered during testing.
  • First-cycle fuel gauge reset: On first use after installation, run one complete discharge down to auto-shutoff, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell's actual discharge curve before the OS starts reporting percentage.

Why the SCP-4920 reports wrong battery percentage after a cell swap

The SCP-4920 uses a fuel gauge IC that builds its capacity model from previous charge cycles. When you install a new cell, that stored model still references the old, degraded cell's discharge curve. The IC maps voltage to percentage incorrectly until it recalibrates. One full discharge-to-shutoff followed by a full uninterrupted charge corrects the coulomb counter and aligns the percentage display to the new cell's actual capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a high current spike and the cell voltage drops sharply below the BMS protection threshold — even though the percentage looks fine. It is a voltage-cliff failure: the fuel gauge shows 25% but the cell cannot sustain voltage under load. The fix is to complete one full calibration cycle so the IC learns where the actual voltage cliff sits on this cell. After calibration, the phone will shut down closer to 5–10% rather than cutting out mid-use at 25%.

Compatible Models

SCP-4920 RL4920

Technical Specifications

Voltage3.7V
Amp Hours1700mAh
Capacity1700mAh
Rate6.29Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

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

Frequently Asked Questions

The phone shut down at around 25% and now it won't turn back on — is the new battery dead already?

It is not dead. High-current draw from the modem or screen caused a voltage spike that tripped the BMS protection cutoff, even though the displayed percentage looked fine. Connect the charger and leave it for 15 minutes — the BMS will reset once input voltage is detected and the cell recovers above 3.0V. After it powers on, run one full discharge-to-shutoff and a full uninterrupted charge to let the fuel gauge IC recalibrate its cutoff threshold.

The battery percentage is jumping around erratically — showing 60%, then 45%, then back to 58% within minutes.

The fuel gauge IC is still running its capacity model against the old, degraded cell's discharge curve. It has not yet mapped the new cell's voltage-to-capacity relationship. Run one complete discharge down to automatic shutoff, then charge to 100% without interrupting the cycle. After that single reference cycle, the coulomb counter recalibrates and the percentage display stabilises.

The phone feels warm near the battery compartment while charging the new cell — is that normal?

Some warmth is expected on the first few charge cycles. A brand-new cell has higher internal impedance than a broken-in one, so the charge IC dissipates slightly more energy as heat while pushing current into it. If the phone becomes hot to the touch or the charger cuts off before 100%, stop charging and check that the charger output is 5V — anything higher can overstress the charge IC on this platform. After two or three full cycles, internal impedance drops and the warmth during charging normalises.

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