3.7 V 500mAh Lithium Ion Battery 802035 – Reliable & Affordable

Lithium polymer (LiPo) batteries like the UFX802035 3.7V 500mAh are widely used in portable devices, wearables, and smart electronics. In this guide, we’ll explain how this battery works, how long it lasts, and how to use and store it properly — plus a buyer’s checklist to help you choose the right one.

Part 1. Understanding 3.7V LiPo battery chemistry and structure

A 3.7V LiPo battery uses lithium-ion polymer chemistry, which provides high energy density and flexible form factor. Unlike cylindrical Li-ion cells, LiPo batteries use a polymer electrolyte and aluminum-laminated pouch design, making them lighter, thinner, and more adaptable in shape.

• Nominal Voltage: 3.7V

• Energy Density: up to 260 Wh/kg

• Lightweight pouch structure (the 802035 model weighs only 10g)

• Customizable size for small devices

This structure allows the 802035 battery to deliver consistent power while keeping the device compact and portable.

Part 2. How long does a 3.7V 500mAh battery last?

The lifespan of a 3.7V 500mAh lithium battery depends on usage conditions, charging rate, and temperature. On average, the Ufine 802035 LiPo battery provides about 300 charge cycles, meaning it can be recharged roughly 300 times before its capacity drops to 80% of the original.

• Charging and discharging rate (0.5C–1C recommended)

• Operating temperature (-20°C to 60°C)

• Proper storage when not in use

With correct usage and charging habits, a 3.7V 500mAh battery can last 2–3 years.

Part 3. How long will a 500mAh battery last in hours?

Battery runtime depends on the current draw (load) of your device. To estimate:

Battery life (hours) = Capacity (mAh) ÷ Load Current (mA)

• If your device consumes 100mA, a 500mAh battery will last about 5 hours.

• If it draws only 50mA, you’ll get around 10 hours.

This makes the 802035 battery perfect for low-power electronics like Bluetooth modules, GPS trackers, and small IoT sensors.

Part 4. Ufine 802035 battery connectors and wires

Ufine offers the 802035 3.7V 500mAh battery with high-quality connectors and wires — customizable to match your application needs.

Standard Configuration:

• Connector: 1.25-2P

• Wire Specification: UL1571-26AWG

• PCB Specification: IC DW01 + MOS 8205

• PCB Dimensions: 14 × 3.8 mm

Custom Options Available: We can tailor connector type, wire length, and protection board according to your device requirements.

Part 5. What to do if a LiPo battery swells (Puffs up)

A swollen LiPo battery is a sign of gas buildup caused by overcharging, overheating, or aging. If your 3.7V 500mAh LiPo battery starts to puff up:

• Disconnect it from your device immediately

• Place it in a fireproof container

• Dispose of it safely at a battery recycling center

Don’t:

• Puncture or compress the battery

• Continue using or charging it

Proper charging and storage can prevent swelling and extend battery life.

Part 6. 500mAh battery charger recommendations

To charge a 3.7V 500mAh LiPo battery, use a constant current/constant voltage (CC/CV) charger with:

• Charging Voltage: 4.2V

• Charging Current: 250–500mA (0.5C–1C rate)

• Protection Cutoff: automatic stop at full charge

Avoid using unregulated USB chargers or power supplies — they may cause overcharging or shorten the battery’s lifespan.

Part 7. How to store a 3.7V 500mAh lithium battery

When storing the 802035 battery, keep it in a cool, dry place and partially charged (around 40–60%).

• Temperature: -20°C to 45°C

• Avoid humidity and direct sunlight

• Recharge every 3–6 months if stored long term

Following these tips helps maintain the battery’s chemical stability and capacity.

Part 8. Buyer’s checklist – what to check before purchasing

Before buying a 3.7V 500mAh lithium battery, make sure to verify these points:

• Size & Dimensions (8×20×35mm) fit your device

• Capacity & Voltage match your power needs

• Protection Circuit (Overcharge, Overdischarge, Short) included

• Connector Type & Wire Length fit your design

•  Certification & Supplier Reliability (KC certified from Ufine)

Choosing the right specification ensures safety, compatibility, and long-term performance.

Part 9. Common mistakes to avoid

⚠️ Using an unprotected LiPo cell without a PCM

⚠️ Overcharging above 4.2V

⚠️ Storing the battery fully charged for long periods

⚠️ Mixing new and old batteries in one pack

⚠️ Ignoring swelling or physical damage

Avoiding these errors will help you get the best performance and safety out of your 802035 3.7V 500mAh battery.

Part 10. Conclusion

The Ufine 802035 3.7V 500mAh LiPo battery combines compact size, stable 3.7V output, and KC-certified safety in one lightweight power source. Whether you need it for IoT devices, wearables, or smart electronics, it’s a reliable choice backed by customization options, factory-direct supply, and 17 years of expertise.