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4100mAh 3.7V Li-Polymer upgraded high capacity replacement battery for Astell & Kern AK380, front view on white background
4100mAh 3.7V upgraded replacement battery for Astell & Kern AK300, back view showing capacity and specification label

4100mAh 3.7V Upgraded High Capacity Battery for Astell & Kern AK300 AK380 – 24% More Power

Original price was: $29.99.Current price is: $25.99.

🔘 4100mAh 3.7V | 🔋 Li-Polymer (Upgraded +24%) | 🎧 For Astell & Kern AK300 / AK380

8 in stock

No PayPal account? 💳 Pay with credit/debit card | 🛡️ PayPal Buyer Protected
SKU: For-AK380-AK300 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$6.8018–30 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

✅ Upgraded Capacity – 4100mAh vs Original 3300mAh (+24%)

✅ CE / RoHS / UN38.3 Certified – Safety tested

✅ 90-Day Warranty – Hassle-free replacement

✅ Ships in 3-7 days with tracking – Fast delivery

🛡️ Shipping Protection Available at Checkout – Covered against loss, damage, or theft

✅ PayPal Buyer Protection included – Secure checkout

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

Compatible with: Astell & Kern AK300, AK380 High-Resolution Audio Players
Battery capacity: 4100mAh (Upgraded – Original is 3300mAh, +24%)
Rated voltage: 3.7V
Charge limit voltage: 4.2V
Battery type: Li-Polymer
Package include: 1 x battery
Extend the playtime of your Astell & Kern AK300 or AK380 high-resolution music player with this upgraded 4100mAh replacement battery. The AK380 features dual AKM AK4490 DACs and supports native DSD playback — demanding significant power for Hi-Res audio. This upgraded Li-Polymer cell delivers 24% higher capacity than the original 3300mAh battery, letting you enjoy extended listening sessions between charges. Built-in multi-layer safety protection guards against overcharge, over-discharge, and short circuits. Made with grade A cells. CE, RoHS, and UN38.3 certified for safety compliance.
Compatibility Note: Fits Astell & Kern AK300 and AK380 only. This is an upgraded high-capacity battery (4100mAh vs original 3300mAh). Professional installation recommended as the player is not designed for user repair. Please check your original battery model before purchasing.
Battery Care Tips: Avoid full discharge (keep above 20%). Keep away from high temperatures. If swelling occurs, stop use immediately. For best performance, use a compatible charger.

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Frequently Asked Questions

This 4100mAh battery is specifically designed for the Astell & Kern AK300 and AK380 high-resolution music players. The AK380 is the 2015 flagship with dual DACs, while the AK300 is its companion model. If your AK380 or AK300 battery is draining too fast or not holding a charge, this upgraded 4100mAh version is the correct replacement — delivering 24% more capacity than the original 3300mAh battery. Please check your original battery model before purchasing.

Yes, this is an upgraded high-capacity battery. Original AK300 and AK380 batteries are 3300mAh. Our replacement delivers 4100mAh — approximately 24% more capacity for extended listening sessions. International sellers on eBay list original capacity batteries for $38-50. If you listen to Hi-Res audio or DSD files, this upgraded battery lets you enjoy more music between charges. Made with grade A cells, CE, RoHS, and UN38.3 certified.

The Astell & Kern AK300 and AK380 are premium devices with sealed construction. Professional installation is strongly recommended. The devices are held together with adhesive and small screws, and the battery connector is delicate. If you are not experienced with electronics repair, please take it to a professional audio device repair shop. For those who choose to DIY, you will need a heat gun, plastic opening tools, and a small Phillips screwdriver. Watch a full disassembly tutorial before starting. We are not responsible for damage caused during DIY installation.

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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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