3.7 V 300mAh Lithium Ion Battery 602030 - Fully Certified

If you’re designing compact electronics that demand stable power in a small form factor, the UFX602030 3.7V 300mAh lithium polymer battery is a reliable solution. Combining lightweight design, high energy density, and full safety certifications, it’s ideal for wearables, IoT devices, medical sensors, and wireless transmitters.

Part 1. Why choose a LiPo battery?

LiPo (Lithium Polymer) batteries are the preferred power source for modern electronics due to their superior performance and flexibility. Here’s why the UFX602030 LiPo battery stands out:

• Compact and Lightweight: Only 6.4 g, with dimensions of 6×20×32 mm, perfect for slim and portable designs.

• High Energy Density: 3.7V nominal voltage and 300mAh capacity in a small footprint.

• Low Internal Resistance: Less than 200mΩ for efficient power delivery.

• Certified Safety: Fully compliant with KC, UL1642, UN38.3, California 65, CE, and IEC62133 standards.

Its stable chemistry and verified safety performance make it suitable even for demanding industrial and consumer applications.

What's UL1642 Certification?

What is UN38.3 Testing?

What is the IEC62133 Certification?

Part 2. What is LiPo battery cycle life?

Cycle life indicates how many times a battery can be charged and discharged before its capacity drops below 80% of its initial level. The UFX602030 lithium polymer battery typically achieves around 300 cycles, depending on usage conditions.

• Avoid full discharges; recharge around 20–30% remaining capacity.

• Use a regulated charger with proper cutoff voltage (4.2V).

• Keep the battery within the recommended temperature range.

Part 3. How long can a 300mAh battery last?

Runtime depends on your device’s current draw. For a 300mAh 3.7V LiPo battery, here are some general estimates:

• 20mA load → ~15 hours

• 50mA load → ~6 hours

• 100mA load → ~3 hours

Since the UFX602030 battery supports a 0.5C–1C discharge rate, it can safely handle loads from 150mA to 300mA continuous current without overheating or voltage sag.

Part 4. Does temperature affect the 602030 battery?

Yes — temperature directly influences both performance and lifespan. The UFX602030 is designed to perform reliably under the following conditions:

• Charging Temperature: 0°C to 45°C

• Discharging Temperature: -20°C to 60°C

• Storage Temperature: -20°C to 45°C

At extremely low temperatures, capacity decreases temporarily; at high temperatures, chemical aging accelerates. Keep the battery away from heat sources for long-term stability.

Part 5. Can you connect 602030 batteries in series or parallel?

Yes, you can — but it requires careful configuration:

• Series Connection (Higher Voltage): Two cells = 7.4V total.

• Parallel Connection (Higher Capacity): Two cells = 600mAh capacity.

Note: ⚠️ Use cells of the same model, age, and voltage level, and always include a protection circuit (PCM) and balancing board (BMS) to prevent overcharging or imbalance.

Part 6. Is the 602030 Battery compatible with your device?

The UFX602030 3.7V 300mAh battery is widely used in compact and portable devices such as:

• GPS trackers and positioning modules

• Bluetooth headsets and transmitters

• Smart pens, fitness bands, and handheld sensors

• Wireless microphones and IoT sensors

• Small-scale robotics and wearable electronics

Its 6×20×32 mm form factor and customizable connector options make it easy to integrate into different circuit designs.

Part 7. What is the 80% rule for LiPo batteries?

The “80% rule” means using only up to 80% of the total capacity before recharging — this helps extend cycle life and prevent deep discharge damage.

For the UFX602030 (300mAh) battery, this means using around 240mAh before recharging. Staying within this limit ensures optimal performance across hundreds of cycles.

Part 8. Buyer’s checklist

Before purchasing a UFX602030 lithium polymer battery, make sure to confirm:

• Dimensions Fit Your Device – Ensure the battery’s size (6×20×32mm MAX) fits your device enclosure.

• Rated Voltage & Capacity – Confirm your device requires 3.7V and that 300mAh meets your runtime needs.

• Charging & Discharging Current – Make sure your charger and device can safely handle 0.5C–1C current.

• Protection Circuit (PCB/PCM) – Verify whether the battery includes a protection board for overcharge, over-discharge, and short-circuit safety.

• Certifications & Compliance – Check for relevant safety certifications such as UL1642, UN38.3, CE, and IEC62133 for safe and reliable usage.

Buying from a reliable manufacturer ensures consistent quality and performance.

Part 9. Common mistakes to avoid

🚫 Charging above 4.2V per cell

🚫 Using the battery without a PCM or protection circuit

🚫 Leaving the battery in hot environments

🚫 Mixing different capacities or brands in one pack

🚫 Long-term storage when fully charged or fully discharged

Always charge with a dedicated LiPo charger, and store at about 50% charge for best results.

Part 10. Conclusion

The UFX602030 3.7V 300mAh LiPo battery offers compact size, stable voltage, and certified safety. With customization options and reliable performance, it’s an excellent choice for small IoT devices, wearable tech, and portable smart electronics.