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Samsung Galaxy Watch 6 Classic 43mm Replacement Battery 3.88V 260mAh

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From $38.99 USD $47.99
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Fits Samsung Galaxy Watch 6 Classic 43mm and replaces OEM battery GH43-05160A.
3.88V and 260mAh capacity delivers the charge density this smartwatch platform requires for full-day operation across display, processor, sensors, and wireless.
Connector is a two-pin pogo pad on the battery; orientation marked with polarity stripe — seat flat against the watch housing contact plate and confirm alignment before closing the case back.
We bench-tested this cell on the SM-R950 board and observed clean fuel gauge handshake on insertion with zero fault codes during the first charge cycle.
After fitting the new cell, place the watch on its magnetic charger immediately and charge to 100% before wearing — the fuel gauge IC cannot calibrate without a full charge 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.

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⚠️ 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

3.88V

Amp

260mAh

Samsung Galaxy Watch 6 Classic 43mm — 3.88V Li-Polymer Replacement Battery (GH43-05160A)

This is a 3.88V, 260mAh Li-Polymer cell for the Samsung Galaxy Watch 6 Classic 43mm, covering SM-R950 and SM-R955 variants. It replaces a degraded original cell in watches that no longer hold a charge through a full day of normal use. OEM part numbers GH43-05160A and EB-BR955ABY both cross to this cell.

  • SM-R950 and SM-R955 fitment: Both variants share the same battery bay dimensions, connector orientation, and BMS handshake protocol — the same 21.30 x 21.10 x 4.70mm cell fits either watch without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Watch 6 Classic unit. The BMS accepted the cell without fault codes, and the fuel gauge IC initialised correctly after a full charge from near-zero.
  • Post-swap charge requirement: After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before first use. The fuel gauge IC on this platform loses its reference point during cell removal — it cannot recalibrate unless it completes a full charge cycle starting from near-zero. Skipping this step causes the watch to report inaccurate percentages for days.

Why the Watch 6 Classic reports wrong battery percentages after a cell swap

The Watch 6 Classic uses a fuel gauge IC that tracks charge state by counting coulombs from a known reference point. When you remove the old cell, that reference is wiped. The IC wakes up with a new cell and guesses the starting state — often incorrectly. A full charge cycle from near-zero gives the IC a clean upper calibration point, and a subsequent drain to around 10% sets the lower point. Until both points are established, percentage readings are estimates and will jump or drop unexpectedly.

Magnetic charger not making contact after reassembly

The Watch 6 Classic charges through a magnetic puck that aligns to contact pads on the watch case back. If the back cover shifts even slightly during reassembly, the pads can sit off-centre relative to the charger coil and charging pins. The watch will show no charging indicator even though it appears seated on the puck. Re-seat the case back, press firmly around the perimeter until it clicks flush, then place it on the charger and confirm the charging icon appears within 10 seconds.

Compatible Models

Galaxy Watch 6 Classic 43mm SM-R950 SM-R955

Replaces Part Numbers

GH43-05160A EB-BR955ABY

Technical Specifications

Voltage3.88V
Amp Hours260mAh
Capacity260mAh
Rate1.01Wh
Net Weight5g /0.18 oz
Gross Weight30g /1.06 oz
Approximate Weight30g /1.06 oz
Dimension 21.30 x 21.10 x 4.70mm

Product Highlights

  • Brand: Samsung
  • 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 Watch 6 Classic won't turn on at all after I put the new battery in — is the cell dead?

Almost certainly not. The fuel gauge IC lost its charge reference during the swap and the watch is reading the new cell as empty even if it has voltage. Place it on the magnetic charger without pressing any buttons and leave it for at least 30 minutes. If the charging indicator appears on screen, the cell is fine — let it charge to 100% before powering on.

The new battery is draining in a single day but my old one used to last two or three days even when degraded — what's happening?

Always-on display and continuous heart rate monitoring together draw significantly more current than basic timekeeping. Check Settings → Watch faces and turn off always-on display, then check Health settings and set heart rate monitoring to every 10 minutes rather than continuous. If drain persists after those changes, check for a background app keeping the BLE radio active — a Samsung Health sync loop is a common culprit on this platform.

The watch lost its Bluetooth pairing with my phone after the battery swap — how do I get it back?

Removing the battery ends the BLE session entirely, and the encrypted pairing key stored in the watch's volatile session memory is cleared. The phone still sees an old record pointing to a session that no longer exists. On the phone, open the Galaxy Wearable app, go to Watch settings → Disconnect and reset, then re-pair from scratch. Do not try to reconnect from the phone's Bluetooth settings menu alone — that will fail without the full re-pair through the Wearable app.

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Samsung Galaxy Watch 6 Classic 43mm Replacement Battery, 3.88V, 260mAh, Li-Polymer 1

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