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361-00104-00 100mAh 3.8V Li-Polymer replacement battery for Forerunner 45 and 45s GPS watches, front view showing battery surface and connector
361-00104-00 100mAh 3.8V replacement battery for Forerunner 45 and 45s, back view showing model number 361-00104-00, capacity 100mAh, and voltage 3.8V on spec label

361-00104-00 100mAh 3.8V Battery for Forerunner 45 45s GPS Watch Replacement

Original price was: $43.99.Current price is: $35.99.

🔘 361-00104-00 100mAh 3.8V | 🔋 Li-Polymer | 📱 For Forerunner 45 45s GPS Watch

8 in stock

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SKU: 361-00104-00 Category: Tags: , , , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ Why Our Warranty Stands Out

Unlike marketplace sellers with short buyer protection windows, we handle claims directly — no automated disputes, no endless back-and-forth.

Compare✅ Qingsm Tech⚠️ eBay / AliExpress
Warranty Period90 days from delivery15-30 days from order confirmation
When It Starts📦 Upon delivery⚠️ Upon order confirmation (even before you receive it)
Claims HandlingWe do it directly — email usAutomated dispute system, seller dependent
After Window ExpiresStill can contact us for supportNo recourse, seller can ignore you

🔋 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$6.8015–25 days
Mexico$10.0020–35 days
Germany, France, United Kingdom$6.5018–30 days
Greece$6.5025–40 days
Austria, Belgium, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Ukraine, Finland, Lithuania$8.0018–30 days
Switzerland$8.0025–35 days
Croatia, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
Moldova$14.0018–30 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam$18.0015–30 days
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 $6.19 (approx. €5.50) 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.

🎁 Combined Shipping Discount: Each additional battery in the same order is charged at 50% off the shipping rate.
🔋 Can't find your battery model? Use our FREE Battery Lookup Service – tell us your device and we'll find a match within 24 hours. 👉 battery.qingsm.tech/find-my-battery

Description

✅ Condition: New – Factory-tested quality & Warranty

✅ 100mAh High Capacity – Restores full battery life for Forerunner 45 / 45s

✅ 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: 361-00104-00
Capacity: 100mAh / 0.38Wh
Rated voltage: 3.8V
Charge limit voltage: 4.35V
Battery type: Li-Polymer
Compatible with: Forerunner 45 / Forerunner 45s
Package include: 1 x battery
Restore the reliable battery performance of your Forerunner 45 or 45s GPS running watch with this 361-00104-00 100mAh replacement battery. The Forerunner 45 series features a lightweight design with GPS tracking, heart rate monitoring, and smart notifications. It delivers up to 7 days of battery life in smartwatch mode and up to 13 hours in GPS mode. After regular charging cycles, the original cell may show signs of aging, such as shorter runtime between charges, sudden shutdowns during activities, slower charging, or a swollen battery compartment. This 100mAh Li-Polymer battery is a direct replacement designed to bring back full daily power for your watch.
Designed for Reliable Daily Use: This battery uses high-density cell technology with multi-layer safety protection against overcharge, over-discharge, and short circuits. It is factory-tested and carries CE, RoHS, and UN38.3 certification. With 100mAh capacity and 3.8V rated voltage, it provides 0.38Wh of energy and supports stable performance for GPS tracking, heart rate monitoring, and daily smartwatch use.
Compatibility Note: This 361-00104-00 100mAh Li-Polymer battery is a compatible replacement for Forerunner 45 and Forerunner 45s. Because third-party replacement batteries can vary by batch, please confirm the battery dimensions and connector type match your original cell before installation. Professional installation is recommended for this sealed smartwatch design. Using an incorrect battery may cause improper fit or charging issues.
Battery Care Tips: Use a compatible charger, avoid extreme heat or cold, and try not to drain the battery to 0% often. For daily use, keep the battery level between 20% and 80% when possible. If you store the watch for a long time, keep the battery at around 50%. After replacing the battery, check that the watch case is resealed correctly to maintain water resistance. If you are not confident, ask a professional technician to do the replacement.

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Frequently Asked Questions

The 361-00104-00 100mAh 3.8V battery is a Li-Polymer replacement battery for Forerunner 45 and Forerunner 45s GPS running watches. This replacement cell provides 100mAh capacity at 3.8V, which is a compatible alternative to the original factory battery. If you need to restore the runtime of your Forerunner 45 or 45s, this 100mAh battery is the matching replacement. Please compare the physical dimensions and connector type with your original battery before ordering, as third-party replacements may require minor fitting.

The 361-00104-00 100mAh 3.8V battery for Forerunner 45 has a capacity of 100mAh / 0.38Wh and a rated voltage of 3.8V, with a charge limit of 4.35V. This Li-Polymer battery is factory-tested and carries CE, RoHS, and UN38.3 certification. It is designed as a compatible replacement for the Forerunner 45 series, offering stable discharge performance for GPS tracking and daily smartwatch use.

Professional installation is recommended for the 361-00104-00 battery in the Forerunner 45 or 45s. The watch has a sealed housing; the technician must open the case carefully, disconnect the old battery, and install the new cell with the correct polarity before resealing. For battery care tips: use a compatible charger, avoid extreme temperatures, keep the battery level between 20% and 80% for daily use, and store at around 50% for long-term storage. Stop using immediately if the battery shows any swelling. After installation, check the case seal to maintain water resistance.

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This battery is in stock and ready to ship within 3-7 days. 90-day warranty included.

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