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FW3S 375mAh 3.8V Li-ion Polymer replacement battery for Moto 360 2nd Gen 42mm SNN5971A, front view showing battery surface and small 2-pin connector

375mAh 3.8V Battery for Moto 360 2nd 42mm FW3S SNN5971A Replacement

Original price was: $34.99.Current price is: $27.99.

🔘 375mAh 3.8V (400mAh typ.) | 🔋 Li-ion Polymer | ⌚ For Moto 360 2nd 42mm FW3S SNN5971A

8 in stock

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SKU: SNN5971A Category: Tags: , , , , ,
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Warranty Period90 days from delivery15-30 days from order confirmation
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🔋 90-day warranty is the industry standard for replacement batteries. Batteries naturally lose capacity over time — this normal wear is not covered. Warranty applies to manufacturing defects only.

📦 Shipping Cost & Delivery Time (Economy Shipping from China)

📦 Note: Batteries are classified as hazardous goods and must be shipped via specialized channels, which may take slightly longer than standard couriers. Delivery times are estimates and may be affected by customs, weather, or other unforeseen circumstances. If your country is not listed in the table below, we are currently unable to ship batteries to that destination.

DestinationFreight (USD)Est. Delivery Time
United States$7.808–15 days
Canada$6.8018–30 days
Mexico$10.0030–60 days
Germany, France, United Kingdom, Greece$6.5018–30 days
Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil$18.0025–60 days

🇧🇷 Note for Brazil: Brazilian customs can occasionally cause delays of up to 80 days or more. And please indicate the recipient's CPF, as it is required for Brazilian customs and shipping. Thanks! We appreciate your understanding.

🇪🇺 Note for EU countries: Due to new EU customs regulations effective July 1, 2026, a flat tariff fee of $4.00 (approx. €3.50) applies to shipments to EU countries. This fee covers customs tariff, handling, and payment processing costs, and will be added at checkout. Thank you for your understanding.

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Description

✅ Condition: Brand New – Never used, factory-tested quality

✅ 375mAh High Capacity – Restores full battery life for Moto 360 2nd Gen 42mm

✅ CE / RoHS / UN38.3 Certified

✅ 90-Day Warranty from delivery – Longer coverage than major platforms

✅ Ships in 3-7 days with tracking

🛡️ Shipping Protection Available at Checkout

✅ PayPal Buyer Protection included

⚠️ Low Stock Alert: Only 8 left in stock. Order now to avoid waiting.

Battery model: FW3S (SNN5971A)
Rated capacity: 375mAh / 1.43Wh
Typical capacity: 400mAh / 1.52Wh
Rated voltage: 3.8V
Charge limit voltage: 4.35V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: Moto 360 2nd Gen 42mm
Package include: 1 x battery
Restore the original battery life of your Moto 360 2nd Gen 42mm smartwatch with this FW3S SNN5971A replacement battery. Released in 2015, the Moto 360 2nd Gen 42mm was one of the most iconic Android Wear smartwatches, featuring a premium round 42mm display, stainless steel case, Qualcomm Snapdragon 400 processor, and the signature “flat tire” ambient light sensor at the bottom of the screen. After 8-10 years of use, the original battery capacity has likely degraded significantly — a common issue with aging smartwatches. This Li-ion Polymer battery restores the full 375mAh rated capacity (400mAh typical), bringing back the reliable daily performance this classic smartwatch was designed for. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified.
Designed for Classic Smartwatch Restoration: The Moto 360 2nd Gen 42mm was praised for its premium design — stainless steel case, genuine leather or metal bands, and a vibrant OLED display with an always-on mode. However, after years of use, battery degradation is the most common issue. Typical symptoms include: the watch not lasting through a full day, needing to be placed on the charger by evening, unexpected shutdowns at 20-30% battery, difficulty powering on without the charger connected, or visible battery swelling. This replacement battery restores the original performance, allowing you to continue wearing this classic smartwatch instead of replacing it with a newer model. For Moto 360 2nd Gen 42mm battery replacement, professional installation is recommended as the watch is sealed with adhesive and requires careful opening to avoid damaging the OLED display or the heart rate sensor.
Compatibility Note: Fits Moto 360 2nd Gen 42mm (FW3S / SNN5971A) only. Please confirm your watch size and model before ordering. This battery is NOT compatible with the Moto 360 2nd Gen 46mm, original Moto 360 1st Gen, Moto 360 Sport, or other smartwatches.

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Frequently Asked Questions

This FW3S SNN5971A battery is compatible with the Moto 360 2nd Gen 42mm smartwatch only. If you need a Moto 360 2nd Gen 42mm battery replacement, this FW3S battery with 375mAh rated capacity is the exact match. The part number SNN5971A is printed on the original battery. For FW3S battery for Moto 360 42mm compatibility, please verify your watch size before ordering — the 42mm version has a smaller casing than the 46mm. This battery is NOT compatible with the Moto 360 2nd Gen 46mm, the original Moto 360 1st Gen, Moto 360 Sport, or other smartwatches. If your Moto 360 2nd Gen battery drains quickly, won't hold a charge, or the watch shuts down at 20-30%, this FW3S replacement battery will restore full performance.

The FW3S battery for Moto 360 2nd 42mm has a rated capacity of 375mAh (1.43Wh) and a typical capacity of 400mAh, with a rated voltage of 3.8V and a charge limit of 4.35V. This FW3S 375mAh 3.8V Li-ion Polymer battery for Moto 360 2nd is built with grade A cells and is CE, RoHS, and UN38.3 certified. For Moto 360 42mm battery life after replacement, expect approximately 1.5-2 days of normal use on a single charge with the 400mAh typical capacity, including notifications, step tracking, and occasional app usage. The watch takes approximately 1-1.5 hours to fully charge with the original charging cradle. For best performance, allow 2-3 full charge cycles after installation to calibrate the battery meter. If your original battery now requires daily multiple charges or shuts down with battery remaining, this replacement will restore the original battery life.

Professional Moto 360 2nd Gen 42mm battery installation is strongly recommended. The Moto 360 2nd has a sealed design with strong adhesive holding the display and back cover. To replace Moto 360 42mm battery FW3S, the technician must carefully heat the screen to soften adhesive, pry it open without damaging the OLED display, disconnect the battery's small 2-pin connector, remove the old battery (adhered), and install the new FW3S battery before resealing. For Moto 360 2nd Gen 42mm battery replacement guide, the watch also contains delicate components — the heart rate sensor, vibration motor, and ambient light sensor — that can be damaged during disassembly. Third-party repair shops with smartwatch experience typically charge $30-50 for this service. For Moto 360 battery health maintenance: 1) Use only the original charging cradle that came with the watch. 2) Avoid exposing the watch to high temperatures (above 40°C / 104°F) during charging. 3) Keep battery level between 20% and 80% for daily use to maximize lifespan. 4) For long-term storage (over 2 months), keep the battery at approximately 40-60% charge. 5) Avoid leaving the watch on the charger continuously for days — unplug once fully charged. For Moto 360 battery care tips, stop using immediately if the battery shows any swelling — a swollen battery in a sealed smartwatch can permanently damage the display.

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