Description
3.7V 40mAh Micro LiPo Battery Pack
Introduction
The 3.7V 40mAh Micro LiPo Battery Pack (Model: WLY501012) is one of the most compact yet powerful energy solutions available for today’s miniaturized electronics. With the growing trend of wearable devices, Internet of Things (IoT) sensors, wireless gadgets, and micro drones, the need for lightweight, rechargeable, and durable battery packs has never been higher. This battery is designed specifically to deliver high energy density in a small form factor while maintaining excellent safety and performance standards.
Unlike conventional alkaline or NiMH batteries, the 3.7V 40mAh Micro LiPo Battery Pack offers superior rechargeability, a longer cycle life, and stable discharge characteristics. These qualities make it the go-to choice for developers, manufacturers, and hobbyists working on projects where space and weight are critical factors.
Whether you’re designing next-generation fitness trackers, wearable health monitors, IoT-enabled devices, or compact drones, this battery provides the balance between power efficiency and compact design that modern technology requires.
Why Choose the 3.7V 40mAh Micro LiPo Battery Pack?
When selecting a power source for compact devices, several key factors come into play: weight, safety, cycle life, and energy efficiency. The 3.7V 40mAh Micro LiPo Battery Pack excels in all these areas. Here’s why it stands out:
- Ultra-Lightweight Design: Weighing just 1.3 grams, this battery minimizes the burden on micro drones, wearables, and other portable devices where every gram matters.
- Reliable Power Output: With a nominal voltage of 3.7V and a capacity of 40mAh, it delivers consistent energy for extended use.
- Enhanced Safety: PCM (Protection Circuit Module) is built-in to protect against overcharge, over-discharge, and short circuits.
- Long Cycle Life: Capable of more than 300 charge/discharge cycles at standard conditions, ensuring durability over time.
- Flexible Applications: Perfect for IoT, wearable devices, toys, wireless electronics, and prototyping.
By combining performance, safety, and size optimization, the 3.7V 40mAh Micro LiPo Battery Pack is a reliable solution for modern electronic designs.
Key Features of the 3.7V 40mAh Micro LiPo Battery Pack
The 3.7V 40mAh Micro LiPo Battery Pack comes with several unique features that set it apart from other small rechargeable batteries:
1. Lightweight and Compact
With dimensions of just 5mm × 10mm × 12mm (and up to 14mm including the PCB), this battery is one of the most space-efficient power sources available. Its ultra-lightweight design ensures seamless integration into even the smallest devices.
2. Safe and Protected
The battery includes a PCM safety circuit that prevents common issues such as overcharging, over-discharging, and overheating. This makes it safer to use in sensitive electronic applications, particularly wearables and wireless devices that operate close to the human body.
3. Rechargeable with Long Cycle Life
Unlike disposable batteries, the 3.7V 40mAh Micro LiPo Battery Pack is rechargeable and can maintain over 300 cycles while retaining at least 80% of its original capacity. This makes it cost-effective and environmentally friendly.
4. Excellent Charge and Discharge Performance
It supports a continuous charge/discharge current of 0.5C and a maximum rate of 1C, allowing it to adapt to varying power requirements in different devices.
5. Stable Energy Output
The battery maintains a steady 3.7V output, ensuring consistent performance in wearables, IoT sensors, and toys that demand reliable operation without voltage fluctuations.
6. Environmentally Friendly
Being rechargeable with a long life cycle reduces battery waste, making it a more sustainable choice compared to disposable alternatives.
7. Versatile Applications
Its combination of small size, safety, and reliability makes it suitable for a wide range of devices—from micro drones to fitness trackers to IoT-enabled smart sensors.
Technical Specifications
For engineers, developers, and DIY enthusiasts, technical details are crucial. Below are the detailed specifications of the 3.7V 40mAh Micro LiPo Battery Pack:
- Model No.: WLY501012
- Nominal Voltage: 3.7V
- Nominal Capacity: 40mAh
- Weight: 1.3g
- Dimensions: 5mm (Thickness) × 10mm (Breadth) × 12mm (Length)
- Maximum Size (including PCB): 5mm × 10mm × 14mm
- Continuous Charge Current: 0.5C
- Continuous Discharge Current: 0.5C
- Maximum Charge Rate: 1C
- Maximum Discharge Rate: 1C
- Life Cycles: ≥300 cycles (0.5C to 2.75V, capacity ≥80%) at 20±5℃
- Connector Type: Open Wire
- Chemistry: Lithium Polymer (Li-Po)
- Protection: PCM Protected
This data highlights the balance between compact design and reliable performance, making the 3.7V 40mAh Micro LiPo Battery Pack an ideal solution for modern lightweight electronics.
Applications of the 3.7V 40mAh Micro LiPo Battery Pack
The 3.7V 40mAh Micro LiPo Battery Pack is designed for a wide variety of modern applications. Its compact size, lightweight design, and reliable rechargeable chemistry make it a perfect fit for gadgets that need stable energy in small dimensions.
1. Wearable Devices
From smartwatches and fitness trackers to medical health monitors, wearables demand a lightweight, safe, and long-lasting power source. The 3.7V 40mAh Micro LiPo Battery Pack provides exactly that, enabling designers to create slim, comfortable devices without sacrificing performance.
2. Micro Drones
Drones are increasingly shrinking in size, and micro drones used for hobby, training, or educational purposes rely on batteries that are both lightweight and powerful. This battery’s 1.3g weight and high energy density make it a natural choice for flight stability and longer runtimes in compact UAVs.
3. IoT Applications
The Internet of Things (IoT) requires small, energy-efficient batteries for devices such as sensors, trackers, and communication nodes. With its 300+ cycle life and stable 3.7V output, the 3.7V 40mAh Micro LiPo Battery Pack ensures reliable connectivity and long-term usage for IoT networks.
4. Portable Electronics
Small portable devices like mini remote controls, MP3 players, and wireless accessories need compact rechargeable batteries. This battery provides a balance between capacity, rechargeability, and safety, making it an excellent fit for such gadgets.
5. Wireless Devices
Wireless communication modules, Bluetooth-enabled gadgets, and RF transmitters require consistent voltage delivery to maintain stable signals. The 3.7V 40mAh Micro LiPo Battery Pack delivers this consistency, ensuring reliable performance.
6. Electronic Toys
Modern toys, especially smart and interactive ones, require small yet powerful batteries that can be recharged easily. The 3.7V 40mAh Micro LiPo Battery Pack powers such toys efficiently while reducing the need for disposable batteries.
Safety Precautions
While the 3.7V 40mAh Micro LiPo Battery Pack is engineered with PCM protection and high-quality Li-Po chemistry, following proper safety guidelines ensures its longevity and prevents hazards.
Temperature Guidelines
- Never store the battery in extreme cold (below 0°C) or heat (above 50°C).
- Avoid leaving the battery under direct sunlight for extended periods.
Charging Precautions
- Do not charge the battery immediately after use; allow it to cool first.
- Always use a charger designed for Li-Po batteries to prevent overcharging or incorrect current flow.
- Do not leave the battery unattended while charging.
Storage Recommendations
- Disconnect the battery from the device when not in use.
- Store it in a non-conductive, fireproof container.
- Maintain a partial charge (around 40–60%) for long-term storage to preserve battery health.
Usage Safety
- Do not puncture, crush, or expose the battery to physical damage.
- Never use a swollen, damaged, or leaking battery.
- Handle with care when integrating into prototypes or DIY electronics.
By observing these precautions, users can maximize the safety and performance of the 3.7V 40mAh Micro LiPo Battery Pack.
Benefits of the 3.7V 40mAh Micro LiPo Battery Pack
Choosing the right power source is critical for small devices, and the 3.7V 40mAh Micro LiPo Battery Pack offers multiple advantages:
1. Ultra-Lightweight Design
At just 1.3 grams, this battery is practically weightless in wearable and drone applications, ensuring that device performance isn’t compromised by excess mass.
2. Compact Size
Its tiny footprint (5 × 10 × 12mm) makes it highly adaptable to miniaturized electronics where internal space is extremely limited.
3. Rechargeable and Cost-Effective
Unlike disposable button cells or alkaline batteries, this pack is rechargeable with more than 300 cycles, reducing long-term costs for both manufacturers and consumers.
4. PCM Protection for Safety
The inclusion of a Protection Circuit Module ensures safe operation by guarding against short circuits, overcharging, and deep discharging.
5. Stable Voltage Output
Devices requiring consistent power delivery benefit from the steady 3.7V output, which prevents erratic behavior in sensitive electronics like IoT sensors and wireless modules.
6. Environmental Friendliness
By being rechargeable and durable, the 3.7V 40mAh Micro LiPo Battery Pack reduces environmental waste compared to disposable alternatives, aligning with sustainable product design goals.
7. Versatility
From toys to IoT devices, from wearables to micro drones, this battery adapts across industries and use cases, proving its reliability as a universal micro power source.
8. Long Service Life
With over 300 usable cycles under proper care, the battery ensures devices can function reliably over months or even years without frequent replacement.
How the 3.7V 40mAh Micro LiPo Battery Pack Works
To truly understand the value of the 3.7V 40mAh Micro LiPo Battery Pack, it helps to know how Lithium Polymer (Li-Po) batteries function. Unlike older chemistries such as NiMH or NiCd, Li-Po cells are built with advanced lithium-ion technology housed in a soft polymer casing.
Inside the battery, lithium ions move between the cathode and anode during charge and discharge cycles. This movement stores and releases energy efficiently, providing a stable 3.7V output for connected devices.
The 40mAh capacity indicates how much energy the battery can store, which translates into runtime for small electronics. For example, in wearables or IoT sensors that consume very low current, this battery can power them for hours before needing a recharge.
Additionally, the Protection Circuit Module (PCM) ensures the battery operates within safe limits by cutting off the circuit during:
- Overcharging (prevents excessive voltage buildup)
- Over-discharging (stops depletion beyond safe levels)
- Short circuits (avoids sudden damage to the device or battery)
This combination of lightweight design, rechargeable chemistry, and built-in protection is what makes the 3.7V 40mAh Micro LiPo Battery Pack a reliable choice for sensitive, miniaturized electronics.
Comparison with Other Batteries
When evaluating power options for compact devices, it’s essential to compare the 3.7V 40mAh Micro LiPo Battery Pack with alternative battery chemistries.
1. vs. Alkaline Button Cells
- Size: Button cells are small but non-rechargeable, requiring frequent replacement.
- Rechargeability: The Li-Po pack offers 300+ cycles, while button cells are disposable.
- Environmental Impact: Disposable cells contribute to waste, while Li-Po batteries are reusable.
👉 Verdict: The 3.7V 40mAh Micro LiPo Battery Pack is more cost-effective and eco-friendly for long-term use.
2. vs. NiMH Batteries
- Energy Density: Li-Po batteries have higher energy density, meaning more power in smaller size.
- Self-Discharge: NiMH batteries lose charge faster when idle; Li-Po batteries retain power longer.
- Weight: NiMH cells are heavier, making them less ideal for wearables and drones.
👉 Verdict: The 3.7V 40mAh Micro LiPo Battery Pack wins on efficiency, weight, and performance.
3. vs. Larger Li-Po Cells
- Portability: Larger Li-Po batteries deliver higher capacity but are too bulky for tiny devices.
- Application Fit: The 40mAh version is specifically optimized for micro devices where every millimeter counts.
👉 Verdict: While bigger Li-Po batteries work for RC cars or drones, the 3.7V 40mAh Micro LiPo Battery Pack is unmatched in ultra-compact designs.
Maintenance Tips for the 3.7V 40mAh Micro LiPo Battery Pack
Proper care ensures maximum lifespan and performance for the 3.7V 40mAh Micro LiPo Battery Pack. Below are best practices every user should follow:
1. Charging Tips
- Always use a dedicated Li-Po charger to avoid overcharging.
- Do not charge above the recommended 1C rate. For a 40mAh pack, this means charging at no more than 40mA.
- Never leave the battery unattended during charging.
2. Storage Tips
- Store at 40–60% charge if unused for extended periods.
- Keep in a cool, dry environment, ideally at room temperature.
- Use a fireproof Li-Po storage bag or container for maximum safety.
3. Usage Tips
- Avoid draining the battery below its cutoff voltage (≈2.75V).
- Disconnect from devices when not in use to prevent slow discharge.
- Monitor the battery during operation—if it becomes swollen, hot, or damaged, discontinue use immediately.
4. Handling Tips
- Do not puncture, bend, or crush the soft polymer casing.
- Avoid exposing the battery to water, humidity, or corrosive environments.
- Handle carefully when soldering or attaching connectors to prevent damage.
5. Extending Cycle Life
- Operate within the recommended temperature range (0–50°C).
- Use the battery in devices that match its capacity; overloading with high current drains reduces life.
- Perform regular maintenance checks on voltage and overall condition.
By following these steps, users can extend the life of the 3.7V 40mAh Micro LiPo Battery Pack, maximizing its 300+ cycle potential while ensuring device reliability.
Buying Guide for the 3.7V 40mAh Micro LiPo Battery Pack
When selecting the right battery for your project, it’s important to consider the unique needs of your device. The 3.7V 40mAh Micro LiPo Battery Pack is designed for wearables, IoT applications, toys, and micro drones. Below are key points to help you make an informed decision:
1. Voltage Compatibility
Always check whether your device is built for a 3.7V power supply. Using an incorrect voltage can damage sensitive electronics. Fortunately, most microcontrollers, wireless modules, and wearable devices are designed for this voltage.
2. Capacity Requirements
The 40mAh rating determines how long your device can run between charges. For ultra-low-power devices like health trackers or IoT sensors, 40mAh is often sufficient. For higher-demand applications, consider pairing multiple cells in parallel to increase capacity.
3. Size and Weight Constraints
At 5mm × 10mm × 12mm (or 5mm × 10mm × 14mm including PCB), this battery is among the smallest available. Its 1.3g weight makes it nearly unnoticeable in wearables and lightweight drones. Ensure your design accommodates these dimensions.
4. Discharge Rate
The 3.7V 40mAh Micro LiPo Battery Pack supports up to 1C max discharge. This means it can deliver 40mA of continuous current safely. If your application requires more current, consider a higher-capacity Li-Po cell.
5. Safety Features
Because it comes with PCM protection, the battery automatically guards against overcharging, deep discharge, and short circuits—making it much safer than unprotected cells.
6. Price vs. Longevity
Although Li-Po batteries are slightly costlier than disposable cells, the ability to recharge 300+ cycles makes the 3.7V 40mAh Micro LiPo Battery Pack far more economical in the long run.
Frequently Asked Questions (FAQs)
1. What is the lifespan of the 3.7V 40mAh Micro LiPo Battery Pack?
The battery offers ≥300 charge cycles at 0.5C rate, retaining at least 80% of its original capacity. With proper care, it can last several years in low-drain devices.
2. Can I use this battery in a smartwatch or fitness tracker?
Yes ✅. The 3.7V 40mAh Micro LiPo Battery Pack is specifically designed for wearables due to its slim size, lightweight build, and safe performance.
3. How do I charge this battery safely?
Always use a dedicated Li-Po charger. Do not exceed the 1C charge rate (40mA), and never leave it unattended during charging.
4. Is it safe to use in toys or DIY electronics?
Yes. Thanks to its PCM protection, it’s safe for toys, IoT prototypes, and DIY devices. However, supervision is recommended when used in children’s products.
5. What happens if I over-discharge the battery?
Over-discharging can permanently damage Li-Po cells. Luckily, the built-in protection circuit prevents discharge below safe levels, protecting both the battery and device.
6. Can I connect multiple 3.7V 40mAh Micro LiPo Battery Packs together?
Yes. Connecting in parallel increases capacity (mAh) while keeping voltage at 3.7V. Connecting in series increases voltage but requires balancing circuits for safety.
7. Is this battery environmentally friendly?
Compared to disposable button cells, yes. The 3.7V 40mAh Micro LiPo Battery Pack reduces battery waste by being rechargeable. However, it should still be recycled properly at the end of its life.
Why Choose the 3.7V 40mAh Micro LiPo Battery Pack?
To summarize, here are the reasons why this battery stands out:
- Ultra-compact design (5 × 10 × 12mm)
- Lightweight build (1.3g) ideal for wearables and micro drones
- Safe PCM protection against overcharge, over-discharge, and short circuits
- Long cycle life with 300+ charge cycles
- Stable 3.7V output for reliable device performance
- Rechargeable and eco-friendly compared to disposables
In the fast-growing world of IoT, wearables, and portable electronics, size and efficiency matter more than ever. The 3.7V 40mAh Micro LiPo Battery Pack delivers all of these benefits without compromising safety.
Conclusion
The 3.7V 40mAh Micro LiPo Battery Pack is more than just a tiny rechargeable cell—it’s a power solution for the next generation of microelectronics. Whether you’re developing a wearable device, testing an IoT prototype, or flying a micro drone, this battery ensures long-lasting, safe, and reliable performance.
With its compact size, lightweight design, and built-in protection, it sets the standard for micro energy storage. And with proper care—such as safe charging, correct storage, and mindful handling—it can deliver consistent performance over hundreds of cycles.
For hobbyists, engineers, and product designers, choosing the 3.7V 40mAh Micro LiPo Battery Pack means unlocking innovation without worrying about power limitations.
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