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BA03 5000mAh 7.78V 2S Li-ion replacement battery for iQOO Z8, front view on white background showing battery surface and connector flex cable
BA03 5000mAh 7.78V replacement battery for iQOO Z8, back view showing model number BA03, capacity 5000mAh, and voltage 7.78V on spec label

BA03 5000mAh 7.78V 2S Li-ion Replacement Battery for iQOO Z8 120W FlashCharge

Original price was: $34.99.Current price is: $28.99.

🔘 BA03 5000mAh 7.78V | 🔋 2S Li-ion | 📱 For iQOO Z8 120W FlashCharge

8 in stock

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SKU: BA03 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.

🔋 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

✅ 2S 7.78V 5000mAh – Dual-cell design

✅ 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: BA03
Total capacity (typical): 5000mAh equivalent (Dual-cell series design, 2S)
Single cell capacity: 2500mAh × 2
Rated capacity: 4880mAh equivalent
Rated voltage: 7.78V (2S Li-ion)
Charge limit voltage: 8.9V (4.45V × 2)
Typical energy: 19.45Wh
Battery type: Li-ion (Dual-cell configuration)
Compatible with: iQOO Z8
Package include: 1 x battery
Restore the battery life of your iQOO Z8 with this BA03 5000mAh 2S Li-ion battery. The iQOO Z8 features a dual-cell series design (2S) — two 2500mAh cells connected in series, delivering a total equivalent capacity of 5000mAh. The device supports 120W FlashCharge fast charging with the original charger. This Li-ion battery delivers the factory-rated capacity for all-day gaming and 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.
Compatibility Note: Fits iQOO Z8 only. This battery uses a dual-cell design (7.78V) — please confirm your original battery voltage before ordering. For reference, iQOO official battery replacement costs 189 RMB ($26) including installation, and third-party repair shops charge 150-220 RMB ($21-30). Professional installation is recommended as the phone has a sealed design. Always check your original battery model before purchasing — BA03 printed on your existing battery.
Charging Instructions: Use only a charger designed for 2S (7.4V-7.78V) Li-ion batteries with FlashCharge compatibility. The iQOO Z8 supports 120W super flash charging (20V/6A). Recommended charge current: 2.5A (1C). Never leave the battery unattended while charging. Do not discharge below 6.0V (3.0V per cell).
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 120W charger. If you notice swelling or overheating, stop use immediately.

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Frequently Asked Questions

The BA03 battery is compatible with iQOO Z8. The iQOO Z8 features a dual-cell series design — two 2500mAh cells connected in series, delivering a total equivalent capacity of 5000mAh. The device supports 120W FlashCharge fast charging. If your iQOO Z8 battery drains quickly or won't hold a charge, this is the correct replacement. For reference, iQOO official battery replacement costs 189 RMB ($26) including installation, and third-party repair shops charge 150-220 RMB ($21-30). Please verify your device model before purchasing.

The BA03 battery has a total equivalent capacity of 5000mAh (typical) / 4880mAh (rated) and a rated voltage of 7.78V. This is because iQOO Z8 uses a dual-cell series design (2S) — two 2500mAh cells connected in series inside a single battery pack, producing 7.78V total. Full charge voltage is 8.9V (4.45V per cell). Typical energy is 19.45Wh. The battery supports the original 120W FlashCharge fast charging capability of the iQOO Z8 (20V/6A maximum input). Some retailers list the single-cell capacity as 2500mAh, while the total equivalent capacity is 5000mAh.

Professional installation is strongly recommended. The iQOO Z8 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. iQOO official service charges approximately 189 RMB ($26) including installation with a 90-day warranty.

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