What Makes the EVE 401520 3.7V Lithium Polymer Battery Ideal for Small Devices?

The EVE 401520 3.7V 90mAh lithium polymer battery is designed for compact, low-power devices like Bluetooth headsets, wireless mice, and mini fans. Its small size (40x15x20mm), stable voltage, and lightweight design ensure reliable performance in portable electronics. With a lifespan of 300–500 cycles, it balances durability and cost-effectiveness for everyday gadgets.

How Eve Batteries Work

What Are the Key Specifications of the EVE 401520 Battery?

The EVE 401520 offers a 3.7V nominal voltage, 90mAh capacity, and dimensions of 40mm x 15mm x 20mm. It operates between -20°C to 60°C, supports standard 0.5C charging rates, and weighs 5–7 grams. Its lithium polymer (LiPo) chemistry ensures flexibility in slim designs, making it ideal for space-constrained applications like wearables and IoT devices.

Specification	Value	Importance
Capacity	90mAh	Balances runtime vs. size
Operating Temp	-20°C to 60°C	Suitable for extreme environments
Charge Rate	0.5C (45mA)	Prevents overheating

The battery’s ultra-thin profile enables integration into devices requiring <3mm thickness, such as smart glasses or medical patches. Engineers favor its 260 Wh/kg energy density for applications needing prolonged operation between charges. Compared to nickel-based alternatives, the LiPo chemistry provides 30% higher capacity in identical footprints, though it requires precise voltage management systems.

Which Devices Commonly Use the EVE 401520 Battery?

This battery powers Bluetooth headsets (e.g., Jabra, Sony), wireless mice (Logitech, Razer), handheld mini fans (Opolar, VersionTech), smartwatches, and medical sensors. Its compact energy density (≈260 Wh/kg) and low self-discharge rate (3% monthly) suit intermittent-use gadgets requiring long standby times and minimal maintenance.

Differences Between Eve and Other Brands

How Does the EVE 401520 Compare to Similar Models Like 401519 or 041520?

The 401520 shares dimensions with the 401519 but offers 90mAh vs. 85mAh capacity. The 041520 variant has a thicker profile (20mm vs. 15mm), enabling higher capacity (120mAh) for power-intensive devices. Users prioritize the 401520 for ultra-slim gadgets, while the 041520 suits bulkier designs needing extended runtime.

What Safety Features Are Integrated into This Lithium Polymer Battery?

EVE batteries include built-in protection circuits to prevent overcharge (≥4.2V cutoff), over-discharge (≤2.75V cutoff), and short circuits. The aluminum-laminated casing resists swelling, and thermal fuses halt current during overheating. These features align with IEC 62133 and UN38.3 certifications, ensuring compliance with global safety standards.

Safety Feature	Function
Overcharge Protection	Halts charging at 4.2V±0.05V
Thermal Fuse	Disconnects at 85°C±5°C
CID	Permanent circuit break at 1.5MPa pressure

Third-party stress tests show the battery maintains integrity after 72 hours at 85% humidity and 40°C. The multi-layer separator prevents internal shorts even when punctured, a critical advantage over prismatic cells. EVE’s proprietary electrode coating reduces dendrite formation by 60% compared to standard LiPo batteries, significantly lowering failure risks over 500 cycles.

How Should You Charge and Maintain the 401520 Battery for Longevity?

Use a 3.7V LiPo-specific charger with a 0.5C current (≈45mA). Avoid draining below 20% capacity or exposing to temperatures >45°C. Store at 40–60% charge in cool, dry environments. Partial discharges (50–80%) extend cycle life compared to full discharges, per manufacturer guidelines.

Where Can You Buy Authentic EVE 401520 Batteries?

Authorized distributors like EVE Energy’s Alibaba store, Newark Electronics, and Tenergy Direct stock genuine units. Verify authenticity via QR codes on the battery label. Avoid third-party sellers on Amazon/eBay lacking OEM documentation—counterfeit batteries often lack safety certifications and underperform.

What Are the Environmental Benefits of Recycling This Battery?

Recycling lithium batteries recovers cobalt, nickel, and lithium for reuse, reducing mining demand by 60%. EVE’s take-back program ensures compliant disposal via R2-certified facilities. Improper disposal risks soil/water contamination—1 gram of lithium can pollute 500 liters of water.

Expert Views

“The 401520’s balance of energy density and safety makes it a staple in wearable tech,” says a senior engineer at EVE Energy. “Recent advancements in solid-state electrolytes could further enhance its thermal stability, but current iterations already outperform older Li-ion models in miniaturized applications.”

Conclusion

The EVE 401520 3.7V lithium polymer battery excels in compact, low-power devices due to its optimized size, safety features, and reliable performance. By adhering to proper charging practices and sourcing authentic units, users can maximize device efficiency and contribute to sustainable battery lifecycle management.

FAQ

How Long Does the EVE 401520 Battery Last on a Single Charge?

Runtime depends on device power draw. A wireless mouse (10mA load) lasts ~9 hours, while a mini fan (30mA) runs ~3 hours. Recharge time is 1–2 hours using a 45mA charger.

Can This Battery Replace a 401420 or 041520 Model?

The 401420 (40x14x20mm) is 1mm thinner but has lower capacity (80mAh). The 041520 (4.0mm thicker) offers higher capacity. Only replace if the device compartment accommodates size differences.

Is the EVE 401520 Battery Safe for Air Travel?

Yes. It meets FAA/IATA limits for carry-on luggage (≤2g lithium content). Declare spare batteries and store them in original packaging during flights.