LEGO 391520 Battery: High-Performance Custom LiPo Replacement (3.8V 90mAh) | A&S Power
When it comes to powering LEGO’s smart electronic devices, generic batteries simply fall short of the required standards. LEGO relies on precision-engineered custom lithium polymer batteries, specifically the 391520 (ICR4/15/20), which is exclusively designed and manufactured by A&S Power. This specialized power solution is built to meet rigorous safety regulations, ensure stable performance, and fit within compact internal design constraints.
This article explores the critical role of custom batteries in LEGO devices, using the 391520 as a primary case study. As the Original Equipment Manufacturer (OEM) for these LEGO-compatible batteries, A&S Power possesses extensive expertise in designing and mass-producing customized power solutions. Many buyers compare li polymer battery vs lithium ion battery when selecting power sources for small electronics. Whether you are an electronic engineer or a LEGO enthusiast seeking a durable replacement, understanding these specifications will guide you to the right power supply.
Technical Specifications: 391520 LEGO Battery (by A&S Power)
LEGO electronic modules.
| Specification | Details | Key Benefits |
|---|---|---|
| Model | 391520 (ICR4/15/20) | A&S Power
Standard dimensions of 4mm x 15mm x 20mm ensure seamless installation and a perfect fit for LEGO electronic components. |
| Rated Voltage | 3.8V | Fine-tuned for low-power LEGO equipment, matching the original circuit design for long-term stable operation. |
| Rated Capacity | 90mAh (0.342Wh) | Optimized balance between lightweight structure and daily usage time, avoiding excess weight while maintaining lasting power. |
| Connector & Wiring | 3-Wire (Red+, Black-, Yellow/NTC) | A&S Power
Features built-in NTC temperature detection for real-time heat monitoring, fully compliant with strict children’s product safety regulations. |
| Manufacturing | The LEGO Group | Produced by A&S Power
Mass-produced using standardized OEM processes to meet strict quality, safety, and durability requirements. |
Why LEGO Trusts A&S Power for Custom Smart Device Batteries
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Precision Engineering & Perfect Fit
Each LEGO electronic toy has limited internal installation space. A&S Power customizes the 391520 with exact dimensions to fit the original shell structure perfectly. It does not interfere with mechanical movement, assembly, or the daily play experience, fully adhering to LEGO’s industrial design rules.Rigorous Safety Compliance
For children’s consumer products, safety is the top priority. All custom lithium polymer battery products from A&S Power have passed global certifications, including UN38.3, IEC, and CE. The built-in NTC wire effectively prevents overheating, short circuits, and abnormal charging, greatly lowering potential risks of battery fires.Stable Discharge & Extended Lifespan
Ordinary universal lithium ion batteries often suffer from unstable voltage output and short cycle lives. A&S Power optimizes internal cell materials and integrates professional protection circuits into the 391520. This ensures a consistent power supply and extends the overall service life of LEGO smart devices.Finding the Right Replacement or Custom Solution (by A&S Power)
If you need a direct replacement for the original LEGO 391520 battery or wish to customize miniature lithium ion polymer battery products for smart electronics, A&S Power is your trusted partner:- Strict Parameter Matching: 3.8V voltage, 90mAh capacity, and the original 3-wire NTC structure for 100% LEGO compatibility.
- Global Safety Certifications: Full support for global sales and consumer product compliance.
- One-Stop Custom Battery Service: Tailored size, voltage, connector, and protection board solutions for smart toys, wearables, and small electronics.
We also share professional guidance on how to dispose of lithium ion batteries in an eco-friendly way after end use.
Frequently Asked Questions (FAQ) | A&S Power
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Conclusion
The compact 391520 custom battery, professionally engineered by A&S Power, demonstrates the importance of tailor-made power solutions for smart toys and miniature electronics. From precise size control to multi-layer safety protection, every detail is designed to offer stable, safe, and user-friendly performance.Whether you are a LEGO fan in need of a high-quality replacement battery or an industry engineer looking for custom LiPo battery solutions, A&S Power is equipped to meet your demands. We specialize in LEGO-compatible batteries and small custom lithium polymer batteries with certified quality and a stable supply chain. A wide range of reliable lithium ion battery solutions are also available for diverse small electronic projects.
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