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AEC751646 3.84V 600mAh Li-ion replacement battery for Fit Pro headphone charging case, front view showing battery surface and connector
AEC751646 3.84V 600mAh replacement battery for Fit Pro headphone case, back view showing model number AEC751646, capacity 600mAh, and voltage 3.84V on spec label

AEC751646 3.84V 600mAh Battery for Fit Pro Headphone Case Replacement

Original price was: $45.99.Current price is: $37.99.

🔘 AEC751646 3.84V 600mAh | 🔋 Li-ion | 📱 For Fit Pro Headphone Case

8 in stock

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SKU: AEC751646 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

✅ 600mAh High Capacity – Restores full battery life for Fit Pro Headphone Case

✅ 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: AEC751646
Capacity: 600mAh / 2.3Wh
Rated voltage: 3.84V
Charge limit voltage: 4.4V
Battery type: Li-ion
Compatible with: Fit Pro Headphone Case
Package include: 1 x battery
Restore the reliable battery performance of your Fit Pro headphone charging case with this AEC751646 600mAh replacement battery. The Fit Pro charging case is designed to provide multiple additional charges for your earbuds, and its internal battery is critical for portable listening. After regular charging cycles, the original cell may show signs of aging, such as the case no longer holding a charge, the earbuds charging slowly inside the case, or the case shutting down unexpectedly. This 600mAh Li-ion battery is a direct replacement designed to bring back full portable charging power.
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 600mAh capacity and 3.84V rated voltage, it provides 2.3Wh of energy and supports stable performance for on-the-go charging of your earbuds.
Compatibility Note: This AEC751646 600mAh Li-ion battery is a compatible replacement for the Fit Pro headphone charging case. Because third-party replacement batteries can vary by batch, please confirm the battery dimensions and connector type match your original cell before installation. Professional soldering or connector transfer may be required. 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 case for a long time, keep the battery at around 50%. After replacing the battery, check that the case housing is reassembled correctly. If you are not confident, ask a professional technician to do the replacement.

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Frequently Asked Questions

The AEC751646 600mAh 3.84V battery is a Li-ion replacement battery for the Fit Pro headphone charging case. This replacement cell provides 600mAh capacity at 3.84V, which is a compatible alternative to the original factory battery. If you need to restore the portable charging power of your Fit Pro case, this 600mAh 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 AEC751646 600mAh 3.84V battery has a capacity of 600mAh / 2.3Wh and a rated voltage of 3.84V, with a charge limit of 4.4V. This Li-ion battery is factory-tested and carries CE, RoHS, and UN38.3 certification. It is designed as a compatible replacement for the Fit Pro charging case, offering stable discharge performance for on-the-go earbud charging.

Professional installation is recommended for the AEC751646 battery in the Fit Pro headphone charging case. The case has a sealed housing; the technician must open the casing carefully, disconnect the old battery, and install the new cell with the correct polarity before reassembling. 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.

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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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