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Sagem MYC5-2v Replacement Battery 3.7V 500mAh SA6M-SN1

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From $22.99 USD $28.99
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Fits Sagem MYC5-2v and replaces OEM part SA6M-SN1, SA6A-SN1, and WGB-630 battery packs.
Delivers 3.7V at 500mAh capacity — adequate for talk and standby on this mid-2000s candybar form factor.
Connector seats flush into the original battery slot with no adapter or modification required.
We bench-cycled this cell through three full discharge-charge runs; the BMS accepted voltage without fault codes on insertion.
On first use after installation, run one complete discharge-charge cycle without enabling any fast-charge mode — the fuel gauge IC needs to recalibrate against this cell's discharge curve.
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.

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

500mAh

Sagem MYC5-2v / VS3 Series — 3.7V Li-Polymer Replacement Battery (SA6M-SN1)

This 3.7V 500mAh Li-Polymer cell replaces the original battery in the Sagem MYC5-2v, MYC5-2M, MYC5-2, VS3, and related models. It matches the OEM dimensions at 48.00 × 34.15 × 4.70mm and uses the same connector layout as the factory cell. Capacity is 500mAh (1.85Wh) — identical to the original specification.

  • MYC5-2 platform compatibility: The MYC5-2v, MYC5-2M, and VS3 share the same battery bay geometry, connector pinout, and 3.7V nominal rail. One cell covers all these variants without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the MYC5-2 platform and confirmed the BMS accepted the charge handshake correctly. The protection circuit responded to cutoff thresholds at both ends of the voltage range without tripping a fault state.
  • Fuel gauge recalibration on first cycle: On first use after installation, run one complete discharge-to-charge cycle before relying on the battery percentage readout. The fuel gauge IC on this phone was calibrated to the original cell's discharge curve — one full cycle lets it remap against the new cell and report accurately.

Why the MYC5-2v shuts down suddenly at 20–30% battery remaining

An aged or deeply cycled Li-Polymer cell loses its ability to hold voltage under load even when the resting voltage looks fine. On the MYC5-2v, the modem and display pull current simultaneously during calls or screen-on events, causing a voltage cliff that triggers the BMS undervoltage cutoff before the percentage gauge reaches zero. The phone reads 25% and cuts out — not a firmware bug, a cell that can no longer sustain voltage under that load. A replacement cell with an intact discharge curve eliminates this behaviour immediately.

MYC5-2v not powering on after sitting in a drawer for months

Li-Polymer cells self-discharge during storage, and the BMS on this platform locks out below approximately 2.5V per cell to prevent damage. A phone stored flat for several months will often reach that lockout threshold and refuse to respond to a standard charger. Connect the phone to a charger and leave it for 20–30 minutes without attempting to power on — the charge IC needs time to trickle current into the cell before the BMS unlocks and allows normal charging. If the phone still shows no response after that wait, check that the charger is delivering at least 5V before replacing the cell.

Compatible Models

MYC5-2v VS3 MYC5-2M MYC5-2 MyC5-2T MYC5-3 MYC5-3i SG345i MY-C5 MYC5 MY-C5-2v MY-C5-3

Replaces Part Numbers

SA6M-SN1 188973731 SA6A-SN1 WGB-630

Technical Specifications

Voltage3.7V
Amp Hours500mAh
Capacity500mAh
Rate1.85Wh
Net Weight9.9g /0.35 oz
Gross Weight35g /1.23 oz
Approximate Weight35g /1.23 oz
Dimension 48.00 x 34.15 x 4.70mm

Product Highlights

  • Brand: Sagem
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The MYC5-2v shows 30% battery and then just dies — why does that keep happening?

The original Li-Polymer cell has lost the ability to hold its voltage when the modem and display draw current at the same time — the resting voltage looks fine, but it collapses under load and triggers the BMS cutoff. The percentage on screen is what the fuel gauge last calculated, not a real-time voltage reading, so the phone cuts out before the gauge reaches zero. This is a cell failure, not a phone fault. Fitting a replacement cell with a solid discharge curve stops the shutdown at that false floor.

The battery percentage is jumping around or sitting stuck at one number after I put in the new cell — is something wrong?

Nothing is wrong with the cell. The fuel gauge IC on the MYC5-2v stores a discharge curve calibrated to the old cell, and it takes one full cycle to relearn the new cell's characteristics. Run the phone down to auto-shutdown, then charge it fully without interrupting the cycle. After that single complete cycle, the fuel gauge recalibrates its coulomb counter against the new cell and the percentage readout stabilises.

My MYC5-2v feels noticeably warm near the back during the first charge with the new battery — should I be concerned?

A new Li-Polymer cell typically has higher internal impedance on the first charge cycle than a broken-in cell, which causes the charge IC to dissipate slightly more heat than usual. This is normal and the warmth should reduce after one or two complete cycles as the cell's impedance settles. If the phone becomes hot to the touch or the back panel feels uncomfortable to hold, disconnect the charger and let it cool before resuming. On subsequent charges, the temperature should return to what you'd expect from a standard charge session.

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