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Sony SmartWatch 3 GB-S10 Replacement Battery 3.7V 280mAh

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New arrival
From $24.99 USD $30.99
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Fits Sony SmartWatch 3 and SWR50; replaces OEM part GB-S10.
3.7V, 280mAh lithium-polymer cell delivers enough charge for full daily operation on the SmartWatch 3 platform.
Flat connector sits flush against the watch's charge contact pads; no locking tab, seats by alignment only.
We bench-tested this cell on a SmartWatch 3 dock — BMS accepted input immediately, fuel gauge IC calibrated over first full charge cycle.
After fitting the new cell, place the watch on its charger immediately and charge to 100% before first use — the fuel gauge IC cannot calibrate without a complete charge cycle from near-zero after a cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

280mAh

Sony SmartWatch 3 SWR50 — 3.7V Li-Polymer Replacement Battery (GB-S10)

This 3.7V, 280mAh lithium-polymer cell replaces the original GB-S10 battery in the Sony SmartWatch 3 (SWR50). It fits the wrist-worn Android Wear device that uses GPS, heart rate monitoring, and continuous Bluetooth connectivity. Swap this in when the original cell no longer carries the watch through a full day.

  • SmartWatch 3 / SWR50 platform fit: Both model designations reference the same hardware — the SWR50 is the internal Sony product code and SmartWatch 3 is the retail name. The GB-S10 cell shares one connector spec and one BMS handshake profile across the run, so this replacement covers the full production range without modification.
  • Bench tested on actual hardware: We ran this cell in an SWR50 unit, confirmed the BMS accepted the new cell without fault codes, and verified that GPS lock, continuous heart rate polling, and NFC all drew current normally. The fuel gauge IC re-initialised correctly after a full charge cycle post-swap.
  • Post-swap charging on the SWR50: Place the watch on its magnetic charger immediately after fitting this cell and charge to 100% before first use. The fuel gauge IC on this platform loses its reference voltage when the old cell is removed — it cannot recalibrate unless it sees a full charge cycle from near-zero on the new cell.

Why the SWR50 battery drains faster with always-on display and continuous HR active

The SWR50 runs an OLED display, a continuous optical heart rate sensor, GPS, and a persistent Bluetooth Low Energy link simultaneously. Each of those draws current independently, and on a 280mAh cell the combined load is significant. Always-on display mode alone keeps the OLED panel lit on a cell this small. Turn off always-on display and set HR monitoring to periodic rather than continuous in Sony's Smartwatch app to bring daily draw back in line with what a 280mAh cell can realistically sustain.

Watch not pairing with phone after battery replacement

Removing the battery cuts power to the BLE stack entirely, which drops the active pairing session stored in the watch's RAM. The phone retains its pairing record but the watch no longer recognises it. On the watch, go to Settings → Reset and clear the Bluetooth pairing data. Then on your Android phone, forget the SmartWatch 3 in Bluetooth settings and re-pair from scratch through the Sony SmartWatch app. Do not attempt to reconnect from the phone side only — both ends need a fresh pairing handshake.

Compatible Models

SmartWatch 3 SWR50

Replaces Part Numbers

GB-S10 GB-S10-353235-0100 1288-9079 1588-0911

Technical Specifications

Voltage3.7V
Amp Hours280mAh
Capacity280mAh
Rate1.04Wh
Net Weight6.5g /0.23 oz
Gross Weight31.5g /1.11 oz
Approximate Weight31.5g /1.11 oz
Dimension 35.75 x 30.30 x 3.20mm

Product Highlights

  • Brand: Sony
  • 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

My Sony SmartWatch 3 shows 0% and won't turn on after I put the new battery in — did I get a dead cell?

The cell is almost certainly fine. When you remove the original battery, the fuel gauge IC on the SWR50 loses its voltage reference and defaults to 0% on the new cell regardless of actual charge state. Place the watch on its magnetic charger immediately and leave it until the charge indicator shows 100%. The gauge will recalibrate during that first full cycle and the watch will power on normally.

The new battery is draining in one day — the old one used to last two days even when it was worn out. What's pulling this much current?

A fresh cell exposes how hard the SWR50's sensors actually work. Always-on display, continuous optical heart rate polling, GPS, and a persistent Bluetooth link run simultaneously on a 280mAh cell. Check the watch settings and switch heart rate monitoring from continuous to periodic, and disable always-on display mode. Those two changes alone cut the baseline draw substantially and bring multi-day use back within reach on a new 280mAh cell.

The magnetic charger contacts aren't making a solid connection after I reassembled the watch — the charging indicator flickers or doesn't appear at all.

The charging contacts on the SWR50 case back shift slightly during disassembly and can misalign when the rear panel is reseated. Remove the rear cover again and check that the internal flex connector for the charge contacts is fully seated before closing the case. Once reassembled, press the watch firmly onto the charger and confirm the charging LED holds steady — a flicker means the contacts are still making intermittent contact. Re-seat the rear panel and apply light, even pressure around the perimeter before locking it down.

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