Sale!
703040 1000mAh 3.7V Li-ion battery with protection board for DIY portable devices, front view on white background
703040 1000mAh 3.7V Li-ion battery, back view showing model number 703040 and capacity specification

703040 1000mAh 3.7V 4-Pin Li-ion Battery with Protection Board for DIY Portable Devices

Original price was: $23.99.Current price is: $13.99.

🔘 703040 1000mAh 3.7V | 🔋 Li-ion with Protection Board | 🔧 Universal for DIY / Portable Devices

8 in stock

No PayPal account? 💳 Pay with credit/debit card | 🛡️ PayPal Buyer Protected
SKU: 703040-4Pin 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

✅ Built-in Protection Board – Overcharge, over-discharge, short circuit protection

✅ 1000mAh Capacity – 500 cycle life (80% retention)

✅ 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.

Battery model: 703040 (dimensions: 7.0 × 30 × 40mm)
Capacity: 1000mAh / 3.7Wh
Nominal voltage: 3.7V
Charge limit voltage: 4.2V
Discharge cut-off voltage: 2.75V
Standard charge/discharge current: 0.5C (500mA)
Max discharge current: 1C (1000mA)
Operating temperature: Charge 0-45°C / Discharge -20-60°C
Cycle life: 500 cycles (retain 80% capacity)
Weight: approx. 20g
Features: Built-in protection board (overcharge, over-discharge, short circuit protection)
Applications: Bluetooth earphones, MP3 players, e-cigarettes, small speakers, GPS devices, children’s toys, DIY projects, and other portable electronics
Package include: 1 x battery
Power your small electronic devices with this 703040 1000mAh 3.7V Li-ion battery. Featuring a built-in protection board, it provides safe and stable performance while preventing overcharge, over-discharge, and short circuits. The compact 7.0×30×40mm size makes it ideal for portable electronics, DIY projects, and device repairs. Made with grade A cells. CE, RoHS, and UN38.3 certified for safety compliance.
Compatibility Note: This is a universal battery. Please verify your device’s battery dimensions (7.0×30×40mm), voltage (3.7V), and connector type before purchasing. Soldering required for installation — does not come with pre-attached wires or connector.
Battery Care Tips: Do not disassemble, crush, or expose to high temperatures. Avoid full discharge (keep above 3.0V). Use a compatible 4.2V Li-ion charger. Store at approximately 50% charge when not in use for extended periods. If swelling occurs, stop use immediately.

Discover more from Battery.qingsm.tech

Subscribe to get the latest posts sent to your email.

Reviews

There are no reviews yet.

Be the first to review “703040 1000mAh 3.7V 4-Pin Li-ion Battery with Protection Board for DIY Portable Devices”

Your email address will not be published. Required fields are marked *
To receive the "Verified Owner" badge, please use the same email address you used when placing your order.

Frequently Asked Questions

This 703040 battery is a universal 1000mAh 3.7V Li-ion cell designed for portable electronics including Bluetooth earphones, MP3 players, e-cigarettes, small speakers, GPS devices, children's toys, and DIY projects. Please verify your device's original battery dimensions (7.0×30×40mm), voltage (3.7V), and wiring before purchasing. Soldering is required for installation — this battery does not come with a pre-attached connector.

Yes, this 703040 Li-ion battery includes a built-in protection board that guards against overcharge (4.2V limit), over-discharge (2.75V cut-off), and short circuit conditions. This provides safer operation for your electronic devices compared to unprotected cells. The protection board is pre-attached to the battery — soldering to your device is required.

The 703040 model number indicates the dimensions: approximately 7.0mm × 30mm × 40mm (thickness × width × length). This is a standard Li-ion battery size used in many portable electronics. Always measure your original battery's dimensions and compare before purchasing, as different devices may have different terminal configurations.

Related products

✅ Ready to order?

This battery is in stock and ready to ship within 3-7 days. 90-day warranty included.

👉 Add to Cart Now