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S77 4000mAh 3.85V Li-ion replacement battery for OUKITEL C18 Pro, front view on white background showing battery surface and connector flex cable
S77 4000mAh 3.85V replacement battery for OUKITEL C18 Pro, back view showing model number S77, capacity 4000mAh, and voltage 3.85V on spec label

S77 4000mAh 3.85V Li-ion Replacement Battery for OUKITEL C18 Pro Mobile Phone

Original price was: $28.99.Current price is: $22.99.

🔘 S77 4000mAh 3.85V | 🔋 Li-ion | 📱 For OUKITEL C18 Pro

8 in stock

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SKU: S77 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
Ireland, Austria, Belgium, Poland, Denmark, Switzerland, Portugal, Norway, Slovakia, Spain, Hungary, Italy, Czech Republic, Luxembourg, Netherlands, Sweden, Cyprus$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
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.

🔋 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: Brand New – Never used, factory-tested quality

✅ 4000mAh High Capacity – All-day battery life

✅ 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: S77
Capacity: 4000mAh / 15.4Wh
Rated voltage: 3.85V
Charge limit voltage: 4.45V
Battery type: Li-ion
Compatible with: OUKITEL C18 Pro
Package include: 1 x battery
Restore the battery life of your OUKITEL C18 Pro with this S77 4000mAh replacement battery. The OUKITEL C18 Pro is a feature-packed smartphone designed for reliable daily use. This Li-ion battery delivers the factory-rated 4000mAh capacity for all-day calls, messaging, and apps. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified. Provides 300-500 charge cycles under normal use.
Compatibility Note: Fits OUKITEL C18 Pro only. For reference, European retailers sell this battery for €19.88-34 ($21.50-37) depending on the seller. Professional installation is recommended as the phone has a sealed design. Always check your original battery model before purchasing — S77 printed on your existing battery.
Battery Care Tips: Avoid full discharge — keep battery level above 20%. Do not expose to high temperatures or direct sunlight. New batteries require 3-5 full charge cycles to reach optimal capacity. For best lifespan, use a certified charger. If you notice swelling or overheating, stop use immediately.

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Frequently Asked Questions

The S77 battery is compatible with OUKITEL C18 Pro only. The C18 Pro is a smartphone from OUKITEL featuring a large battery capacity. If your C18 Pro battery drains quickly or won't hold a charge, this is the correct replacement. For reference, European retailers sell this battery for €19.88-34 ($21.50-37) depending on the seller. German retailer akkucelle.com offers this battery for €19.88 ($21.50), while French tousbatterie.com lists it for €31.50 ($34). Please check your original battery model before purchasing — S77 printed on your existing battery.

The S77 battery has a capacity of 4000mAh (15.4Wh) and a rated voltage of 3.85V. Charge limit voltage is 4.45V. It is a Li-ion battery built with grade A cells and is CE, RoHS, and UN38.3 certified. This replacement matches the factory specifications for OUKITEL C18 Pro. Provides 300-500 charge cycles under normal use.

Professional installation is strongly recommended. The OUKITEL C18 Pro has a sealed design with strong adhesive. Replacing the battery requires heating to soften adhesive and careful prying to avoid damaging the display. If you choose to DIY, watch a full teardown tutorial before starting, use a heat gun at low temperature (no more than 70°C), and never reuse a battery after removal. Third-party repair shops typically charge $15-30 for labor. European sellers like akkucelle.com offer this battery with 12-month warranty for €19.88.

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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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