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3909 4500mAh 3.85V Li-ion Polymer replacement battery for Ulefone 3909, front view showing battery surface and connector
3909 4500mAh 3.85V replacement battery for Ulefone 3909, back view showing model number 3909, capacity 4500mAh, and voltage 3.85V on spec label

3909 4500mAh 3.85V Battery for Ulefone 3909 Replacement

Original price was: $49.99.Current price is: $44.99.

🔘 3909 4500mAh 3.85V | 🔋 Li-ion Polymer | 📱 For Ulefone 3909

8 in stock

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SKU: 3909 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, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, Ukraine$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: New – Factory-tested quality & Warranty

✅ 4500mAh High Capacity – Restores full battery life for Ulefone 3909

✅ 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

✅ 100% Compatibility Guarantee – If it doesn’t fit, we’ll refund you. No questions asked.

Battery model: 3909
Capacity: 4500mAh / 17.33Wh
Rated voltage: 3.85V
Charge limit voltage: 4.4V
Battery type: Li-ion Polymer
Compatible with: Ulefone 3909
Package include: 1 x battery
Restore the reliable battery performance of your Ulefone 3909 with this 3909 4500mAh replacement battery. The Ulefone 3909 is a daily-use phone designed for calls, social apps, photos, and mobile work. After regular charging cycles, the battery may show signs of aging, such as shorter runtime, sudden shutdowns, slower charging, or a swollen back cover. This 3909 Li-ion Polymer battery is designed to fit Ulefone 3909 and bring back full daily power.
Designed for Reliable Daily Use: The 3909 battery uses high-density battery 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 4500mAh capacity and 3.85V rated voltage, it supports stable performance for calls, messaging, social apps, and daily mobile use. The battery is a practical replacement option for Ulefone 3909 users who need dependable power throughout the day.
Compatibility Note: Fits Ulefone 3909 only. Please confirm your battery model before ordering — 3909 is printed on your current battery. Verify that your battery matches the model number, rated voltage (3.85V), and capacity (4500mAh / 17.33Wh). This device has a sealed design — professional installation is recommended. Using an incorrect battery model may cause improper fit, charging issues, or incorrect battery reporting.
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 phone for a long time, keep the battery at around 50%. After replacing the battery, check that the back cover is closed correctly. If you are not confident, ask a professional technician to do the replacement.

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Frequently Asked Questions

The 3909 4500mAh 3.85V battery for Ulefone 3909 is a Li-ion Polymer replacement battery for Ulefone 3909. This Ulefone 3909 battery replacement has 4500mAh capacity and 3.85V rated voltage. If you need a Ulefone 3909 battery replacement, the 3909 4500mAh battery is the matching model. Please check your current battery label — 3909 is printed there. This 3909 battery for Ulefone 3909 is designed to restore full performance when your current battery no longer holds charge as before.

The 3909 4500mAh 3.85V battery for Ulefone 3909 has a capacity of 4500mAh / 17.33Wh and a rated voltage of 3.85V, with a charge limit of 4.4V. This 3909 3.85V 4500mAh Li-ion Polymer battery is factory-tested and carries CE, RoHS, and UN38.3 certification. 3909 battery specifications for Ulefone 3909 include stable charging performance. To support accurate battery reporting, allow 2-3 full charge cycles after installation to calibrate the battery meter.

Professional Ulefone 3909 battery installation is recommended. The Ulefone 3909 has a sealed design with an internal battery. To replace the Ulefone 3909 battery 3909, the technician must open the back cover carefully, disconnect the battery connector, remove the old battery, and install the new 3909 battery before resealing the device. For 3909 battery installation in Ulefone 3909, improper handling can affect the device sealing. For Ulefone 3909 battery care tips: use a compatible charger, avoid extreme temperatures, keep 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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