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Samsung Galaxy Watch 4 Classic Replacement Battery 3.88V 410mAh

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From $40.99 USD $50.99
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Fits Samsung Galaxy Watch 4 Classic SM-R960 and SM-R965; replaces OEM part GH43-05162A and EB-BR965ABY.
3.88V, 410mAh Li-Polymer cell delivers the charge capacity needed to run the display, processor, and continuous heart rate monitoring.
Connector is a two-pin pogo contact pad; align the battery terminals with the dock contacts and seat firmly until the retention clip engages.
We ran load cycles simulating heart rate polling and screen-on time; the BMS accepted the new cell without cutoff or voltage sag faults.
After fitting this cell, place the watch on its charger immediately and charge to 100% before wearing—the fuel gauge cannot recalibrate without a complete charge cycle after a 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

410mAh

Samsung Galaxy Watch 6 Classic 47mm — 3.88V Li-Polymer Replacement Battery (GH43-05162A)

This 3.88V, 410mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy Watch 6 Classic 47mm, SM-R960, and SM-R965. It restores power to the display, processor, heart rate sensor, and wireless connectivity stack. Fit the new cell when the original no longer holds charge through a full day of typical use.

  • SM-R960 and SM-R965 compatibility: Both watch variants share the same physical cell format, voltage rail, and BMS connector pinout. The fuel gauge IC on both models reads the same cell impedance profile, so the handshake completes without errors on either variant.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SM-R965 platform. The BMS accepted the cell without fault codes, fuel gauge initialised after a full charge cycle, and all sensor draws — including continuous heart rate — stayed within expected current limits.
  • Post-swap charge requirement: After fitting this cell, place the watch immediately on its magnetic charger and bring it to 100% before first use. The fuel gauge IC on these Galaxy Watch platforms loses its reference point when the cell is swapped and cannot recalibrate accurately without one complete charge cycle from near-zero.

Why the Galaxy Watch 6 Classic reports 0% immediately after a cell swap

The Galaxy Watch 6 Classic uses a dedicated fuel gauge IC that tracks battery state by accumulating charge and discharge data over time. When the cell is removed, that accumulated reference is wiped. The IC has no baseline to work from, so it defaults to reporting 0% or shuts the display off entirely. This is not a fault with the replacement cell. Place the watch on its charger straight after reassembly and charge uninterrupted to 100% — the gauge recalibrates during that first full cycle and will read accurately from then on.

Magnetic charge contacts not seating after reassembly

If the watch sits on the magnetic charger but shows no charging indicator, the rear contact pads have likely shifted slightly during the swap. Even a fraction of a millimetre of misalignment breaks the circuit between the charger pins and the watch contacts. Remove the watch from the charger, press the rear cover firmly and evenly until it clicks flush, then reseat it on the charger. Confirm the charging icon appears within 10 seconds of placement.

Compatible Models

SM-R960 SM-R965 Galaxy Watch 6 Classic 47mm

Replaces Part Numbers

GH43-05162A EB-BR965ABY

Technical Specifications

Voltage3.88V
Amp Hours410mAh
Capacity410mAh
Rate1.59Wh
Net Weight7g /0.25 oz
Gross Weight32g /1.13 oz
Approximate Weight32g /1.13 oz
Dimension 24.40 x 23.90 x 5.20mm

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 Galaxy Watch 6 Classic battery drains completely in one day — is this normal with a new cell?

A new cell draining in one day usually points to always-on display running alongside continuous heart rate monitoring — that combination pulls significantly more current than standard use. Check Samsung Health settings and turn continuous HR monitoring to every 10 minutes rather than real-time. Always-on display is the single largest draw on this platform; disabling it drops daily consumption noticeably. If drain persists after those two changes, the fuel gauge IC may still be calibrating — run two full charge-to-100% cycles first.

My Galaxy Watch 6 Classic won't pair with my phone after the battery swap — what happened?

Removing the battery kills the active BLE session and clears the secure pairing handshake stored in volatile memory. The watch and phone no longer recognise each other as a trusted pair. Open the Galaxy Wearable app on your phone, select "Unpair" or "Remove watch," then initiate a fresh pairing from the watch's Bluetooth settings. The process takes under two minutes and restores full connectivity.

The heart rate sensor seems to be draining the new battery faster than it drained the old one — why?

A fresh cell has a slightly different internal impedance than a worn one, and the heart rate sensor's current draw interacts differently with that impedance during the first several charge cycles. This shows up as higher-than-expected drain in the first week. It settles as the cell's impedance stabilises through use. If the drain does not normalise after five full charge cycles, check that the sensor lens is clean and fully seated — a partial contact causes the sensor to retry reads continuously, increasing current draw.

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Samsung SM-R960 Replacement Battery, 3.88V, 410mAh, Li-Polymer 1

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