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S90 4000mAh 3.87V Li-ion Polymer replacement battery for OUKITEL S90 and C21Pro, front view showing battery surface and small 2-pin connector

S90 4000mAh 3.87V Battery for OUKITEL S90 C21Pro Replacement

Original price was: $34.99.Current price is: $29.99.

🔘 S90 4000mAh 3.87V | 🔋 Li-ion Polymer | 📱 For OUKITEL S90 / C21Pro

8 in stock

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SKU: S90 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

✅ 4000mAh High Capacity – Restores full battery life for OUKITEL S90 / C21Pro

✅ 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.

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

Battery model: S90
Capacity: 4000mAh (typical) / 15.48Wh
Rated voltage: 3.87V
Charge limit voltage: 4.45V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: OUKITEL S90, OUKITEL C21Pro
Package include: 1 x battery
Restore the reliable battery performance of your OUKITEL device with this S90 4000mAh replacement battery. Designed for the OUKITEL S90 and C21Pro, this battery brings back the consistent daily endurance your smartphone was built for. After 1-2 years of regular charging cycles, the original battery’s capacity naturally declines. This Li-ion Polymer battery restores the full 4000mAh capacity, ensuring dependable performance for daily use. 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 Reliable Daily Use: The 4000mAh battery in the OUKITEL S90 and C21Pro originally provided dependable endurance for calls, messaging, browsing, and daily tasks. After years of charging cycles, battery capacity degrades significantly. Common symptoms include: the device requiring more frequent charging than when new, unexpected shutdowns at 15-20% battery remaining, slower charging than when new, or visible battery swelling. This replacement restores the original endurance, allowing you to continue using your OUKITEL S90 or C21Pro without interruption. The S90 battery uses advanced high-density cell technology with multi-layer safety protection, ensuring reliable performance for years to come.
Compatibility Note: Fits OUKITEL S90 and OUKITEL C21Pro only. Please confirm your battery model before ordering — S90 is printed on your original battery. Verify that your current battery matches the model number, rated voltage (3.87V), and capacity (4000mAh / 15.48Wh). Using an incorrect battery model may cause improper fit, charging issues, or incorrect battery reporting.

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Frequently Asked Questions

The S90 4000mAh battery for OUKITEL S90 is compatible with OUKITEL S90 and OUKITEL C21Pro. If you need an OUKITEL S90 battery replacement or OUKITEL C21Pro battery replacement, this S90 4000mAh battery is the exact match. For S90 battery for OUKITEL S90 compatibility, please verify your device model in Settings > About Phone or check the label on your original battery — the model number S90 is printed there. The OUKITEL S90 and C21Pro are smartphones with a 4000mAh battery design. If your OUKITEL S90 battery no longer holds charge as it did when new or shuts down unexpectedly, this S90 replacement battery will restore the full performance.

The S90 4000mAh battery for OUKITEL S90 has a typical capacity of 4000mAh (15.48Wh) and a rated voltage of 3.87V, with a charge limit of 4.45V. This S90 3.87V 4000mAh Li-ion Polymer battery is built with Grade A cells and is CE, RoHS, and UN38.3 certified. S90 battery specifications are designed for reliable daily performance. For best performance, allow 2-3 full charge cycles after installation to calibrate the battery meter. If your original OUKITEL S90 battery now requires more frequent charging than when new, this replacement will restore the original capacity.

Professional OUKITEL S90 battery installation is recommended. The OUKITEL S90 has a sealed design with an internal battery. To replace OUKITEL S90 battery S90, the technician must heat the back cover to soften adhesive, carefully pry it open to avoid damaging the display or frame, disconnect the battery's small 2-pin connector, remove the old battery, and install the new S90 battery before resealing the device. For S90 battery installation OUKITEL S90, improper handling can damage the display or compromise the device's sealing. Third-party repair shops typically charge $15-30 for labor. For OUKITEL S90 battery health maintenance: 1) Use the original charger and cable for optimal charging. 2) Keep battery level between 20% and 80% for daily use to maximize the lifespan of the 4000mAh cell. 3) Avoid exposing the device to high temperatures (above 40°C / 104°F), especially while charging. 4) For long-term storage (over 2 months), keep the battery at approximately 40-60% charge. 5) Perform a full calibration cycle after installation: drain the device until it auto-shuts off, then charge uninterrupted to 100%. For OUKITEL S90 battery care tips, stop using immediately if the battery shows any swelling.

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