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Samsung Gear S Replacement Battery 3.7V 170mAh EB-BR750

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From $23.99 USD $29.99
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Fits Samsung Gear S smartwatch models R750, R750V, R750R4 — replaces EB-BR750, EB-BR750ABE, AA1FA09fs/-B.
Voltage 3.7V, capacity 170mAh — powers the curved AMOLED display and continuous heart rate sensor throughout the day.
Connector sits flush against the magnetic charging contacts on the watch case bottom; alignment matters for consistent charging grip.
We bench-tested the cell on a Gear S R750 BMS — fuel gauge initialized correctly on first charge cycle without error codes.
After installation, place the watch on its magnetic charger and charge to 100% before wearing — the fuel gauge IC cannot calibrate without a full cycle from zero after battery swap.
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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

170mAh

Samsung Gear S / Galaxy Gear S R750 — 3.7V Li-Polymer Replacement Battery (EB-BR750ABE)

This 3.7V, 170mAh Li-Polymer cell replaces the original EB-BR750ABE battery in the Samsung Gear S smartwatch. It fits the SM-R750V, SM-R750R4, and all variants in the Galaxy Gear S R750 line. Dimensions are 30.60 × 27.80 × 3.48mm — matching the curved cell bay in the original chassis.

  • R750 platform fit: The SM-R750 series shares a single battery bay spec across carrier variants — Verizon (SM-R750V), US Cellular (SM-R750R4), and unlocked units. The connector pinout and BMS handshake are identical across all, so one cell covers the full line.
  • Bench tested on actual hardware: We cycled this cell through the R750 charge controller and confirmed the BMS accepted the new cell without fault flags. Charge acceptance and cutoff voltage at 4.2V both matched factory spec.
  • Post-swap charge requirement: After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before use. The fuel gauge IC on the R750 loses its reference point when the cell is swapped and cannot recalibrate without a full charge cycle from near-zero.

Why the Gear S shows 0% immediately after a battery swap

The R750 uses a coulomb-counting fuel gauge IC that tracks charge state relative to a stored reference. When you remove the old cell, that reference resets to zero. The watch reports 0% because the IC has no data on the new cell's actual state of charge. Placing the watch on the charger right after reassembly lets the IC run a full calibration sweep from near-empty to 4.2V. After one complete charge cycle, the percentage readout stabilises and tracks accurately.

Gear S draining to empty within a single day after swap

If the watch drops to zero within a day, the most common cause is the always-on display combined with continuous heart rate monitoring running simultaneously — both were likely disabled on the degraded original cell to conserve power. The new cell exposes full draw for the first time. Check Settings → Watch faces and turn off Always On Display if it was re-enabled automatically after the swap. Also verify HR monitoring is set to manual rather than continuous in the Samsung Health app, which cuts resting sensor current significantly.

Compatible Models

Gear S Galaxy Gear S R750 SM-R750V SM-R750R4 SM-R750P SM-R750B SM-R750D SM-V750 SM-R750A

Replaces Part Numbers

EB-BR750 EB-BR750ABE AA1FA09fs/-B

Technical Specifications

Voltage3.7V
Amp Hours170mAh
Capacity170mAh
Rate0.63Wh
Net Weight5.4g /0.19 oz
Gross Weight30.4g /1.07 oz
Approximate Weight30.4g /1.07 oz
Dimension 30.60 x 27.80 x 3.48mm

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 Gear S won't pair with my phone after I replaced the battery — what happened?

Removing the battery cuts power to the BLE module and drops the active Bluetooth session entirely. The watch loses its bonding state and the phone no longer recognises it as a known device. Open the Galaxy Wearable app on your phone, select "Disconnect" or "Unpair," then put the Gear S into Bluetooth pairing mode via Settings → Connections → Bluetooth and pair it fresh.

The magnetic charger isn't charging the Gear S after reassembly — the watch just sits there with no charging indicator.

The charge contacts on the case back need to align precisely with the magnetic pogo pins on the charger. Reassembly can shift the rear cover by a fraction of a millimetre, breaking contact even when the magnet holds. Remove the watch from the charger, re-seat the rear cover firmly until you feel it click flush all the way around, then place it back on the charger and confirm the charging icon appears on screen.

The heart rate sensor seems to be killing the new battery much faster than the old one — is something wrong with the cell?

Nothing is wrong. A new cell delivers full voltage across its range, so sensors that were current-limited on a degraded cell now draw their full rated current. The HR sensor on the Gear S pulls more current against a fresh cell's lower internal impedance. This normalises after the first week as the cell's impedance settles. If drain is still excessive after seven days, go to Samsung Health → Settings → Measure heart rate and set it to "Manual" rather than "Always."

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