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WLY902025 3.7V 400mAh 1S LiPo Battery – Micro Rechargeable Battery Pack for Wearables / Micro Drone / IoT

Original price was: ₹480.00.Current price is: ₹398.00.

  • Brand: NDB&C BY LOFTY AGROTECH

  • Type: 3.7V 400mAh 1S Micro LiPo Battery

  • Applications: Wearables, Micro Drones, IoT, Wireless Devices

  • Features: PCM protection, long cycle life, lightweight design

  • Dimensions: 9mm × 20mm × 25mm

  • Weight: 8g

Description

WLY902025 3.7V 400mAh LiPo Battery

Introduction to the 3.7V 400mAh LiPo Battery

The 3.7V 400mAh LiPo Battery has quickly become one of the most essential power solutions in modern electronics. From wearable devices and fitness trackers to micro drones, IoT modules, and wireless gadgets, this compact yet powerful energy source is shaping the way technology is designed and used. Its ability to deliver lightweight, rechargeable, and high-capacity power makes it the preferred choice for both consumer and industrial applications.

The WLY902025 model, manufactured by NDB&C BY LOFTY AGROTECH, represents the next step in LiPo battery innovation. Built with a 400mAh capacity and a stable 3.7V nominal voltage, it provides the perfect balance between energy density and compact size. This means engineers, product developers, and hobbyists can design smaller, lighter, and more efficient devices without compromising performance.

Unlike traditional NiMH or alkaline batteries, the 3.7V 400mAh LiPo Battery offers a far more sustainable and cost-effective solution. It is rechargeable, supports over 300 charge/discharge cycles, and includes PCM protection features for safety. This not only reduces electronic waste but also enhances reliability, making it an eco-conscious option for today’s environmentally aware industries.

Whether you’re working on the next-generation wearable device, developing IoT-based smart solutions, or designing miniature RC drones, the 3.7V 400mAh LiPo Battery delivers the dependable energy required to power your ideas.


Why Choose the 3.7V 400mAh LiPo Battery?

Compact Yet Powerful

The 3.7V 400mAh LiPo Battery is designed to be ultra-compact, with dimensions of just 9mm × 20mm × 25mm, and a maximum size of 27.5mm including the PCB. Despite its small form factor, it can store enough energy to power wearables, wireless devices, and micro drones effectively.

 Lightweight Design

Weighing only 8 grams, this battery minimizes the overall load on devices like drones and wearable electronics. For applications where every gram matters, the 3.7V 400mAh LiPo Battery is an ideal solution.

 Long Cycle Life

With ≥300 charge-discharge cycles at 0.5C, this battery provides an excellent lifespan, ensuring that users get long-term performance without frequent replacements.

PCM Protection

The 3.7V 400mAh LiPo Battery includes a Protection Circuit Module (PCM) to safeguard against risks such as overcharging, over-discharging, and short circuits, guaranteeing both safety and reliability.


⚙️ Technical Specifications of WLY902025 3.7V 400mAh LiPo Battery

The WLY902025 3.7V 400mAh LiPo Battery is engineered with precision to meet the performance, safety, and size requirements of today’s compact electronics. Below is a detailed breakdown of its technical specifications and what they mean for practical applications.


🔌 Electrical Characteristics

Nominal Voltage: 3.7V
The 3.7V nominal voltage ensures that this LiPo battery delivers a consistent and stable power supply, making it compatible with a wide range of electronics such as wearables, IoT devices, wireless gadgets, and micro drones. Unlike conventional cells that can experience significant voltage drops, the 3.7V 400mAh LiPo Battery maintains its stability, which is critical for devices requiring uninterrupted performance.

Nominal Capacity: 400mAh
With a 400mAh capacity, this battery offers the perfect balance of energy storage and portability. It provides sufficient runtime for small devices without adding unnecessary bulk. For example, in a wearable fitness tracker, the 3.7V 400mAh LiPo Battery can power the device for extended use while still fitting into slim, lightweight designs.

Continuous Charge Current: 0.5C
This means the battery is optimized to be charged at half its rated capacity, ensuring a safe and controlled charging process. Charging at 0.5C protects the battery from overheating and prolongs its lifespan. For daily use in gadgets and drones, this makes the 3.7V 400mAh LiPo Battery both reliable and long-lasting.

Continuous Discharge Current: 0.5C
The ability to safely discharge at 0.5C ensures steady performance during normal operation. For IoT sensors or portable gadgets that run continuously, this stability guarantees efficient energy delivery without fluctuations that could disrupt device function.

Maximum Charge Rate: 1C
The 1C charge rate allows the battery to be charged faster when needed, reducing downtime. This is especially useful for hobbyists or engineers who need quick turnaround times in prototyping or drone racing. With proper charging equipment, the 3.7V 400mAh LiPo Battery supports fast yet safe recharging.

Maximum Discharge Rate: 1C
For applications requiring higher bursts of power, such as micro drones or RC toys, this battery can safely discharge at 1C. This capability ensures smooth operation during demanding tasks, where responsiveness and consistent output are essential.

👉 Why this matters: These electrical characteristics collectively make the 3.7V 400mAh LiPo Battery versatile, safe, and dependable for a wide range of small-scale electronics.


📏 Mechanical Dimensions

  • Thickness: 9mm
  • Width: 20mm
  • Length: 25mm
  • Maximum Size with PCB: 9 × 20 × 27.5mm
  • Weight: 8g

Compactness is one of the greatest strengths of the WLY902025 3.7V 400mAh LiPo Battery. At just 9mm thick and weighing only 8 grams, it is light enough to integrate seamlessly into miniaturized devices without adding noticeable bulk.

For drone applications, this minimal weight is crucial—every gram saved contributes to better flight performance and longer air time. In wearables, the slim profile ensures user comfort, making it ideal for fitness trackers, health monitors, and smartwatches.

The addition of a Protection Circuit Module (PCM) only slightly increases the size to 27.5mm in length but dramatically improves safety. This makes the 3.7V 400mAh LiPo Battery not only compact but also secure for integration into sensitive electronics.


🔄 Cycle Life & Longevity

Cycle Life: ≥300 cycles at 0.5C to 2.75V (at 20 ± 5°C, maintaining >80% capacity).

This means the 3.7V 400mAh LiPo Battery can be charged and discharged over 300 times before its capacity drops below 80% of its original rating. In real-world usage, this translates to years of dependable service when used under proper conditions.

For example:

  • A wearable fitness tracker charged once daily could last nearly a full year before reaching 300 cycles, and even then, it would still retain at least 80% capacity.
  • IoT sensors with lower power draw could run for multiple days per charge, extending the effective service life even further.

Compared to disposable batteries, this rechargeable cycle life dramatically reduces electronic waste and offers better long-term value. When compared with NiMH or alkaline cells, the 3.7V 400mAh LiPo Battery clearly outperforms in both efficiency and sustainability.


Applications of the 3.7V 400mAh LiPo Battery

⌚ Wearable Electronics

Wearables such as smartwatches, fitness trackers, medical monitoring devices, and health bands are designed to be compact, lightweight, and comfortable for everyday use. The 3.7V 400mAh LiPo Battery is perfectly suited for these devices because of its slim profile (9 × 20 × 25mm) and lightweight design (just 8g).

These devices demand stable voltage output to ensure uninterrupted performance throughout the day. For instance, a smartwatch using this battery can reliably track health data, run apps, and maintain Bluetooth connectivity without frequent recharging. Similarly, medical wearables like heart-rate monitors or glucose tracking devices require batteries that are both dependable and safe, which the PCM-protected 3.7V 400mAh LiPo Battery ensures.


🌐 IoT Devices

The Internet of Things (IoT) ecosystem is expanding rapidly, and most IoT devices require compact, portable, and rechargeable energy solutions to function effectively. The 3.7V 400mAh LiPo Battery is widely used in:

  • Smart home automation sensors (motion detectors, temperature sensors, smart door locks)
  • Industrial IoT modules (data logging devices, environmental monitors)
  • Smart agriculture systems (soil sensors, wireless irrigation controllers)

Since IoT devices are often placed in remote or difficult-to-access locations, they need a power solution that is both durable and long-lasting. With its low self-discharge rate and ≥300 charge-discharge cycles, the 3.7V 400mAh LiPo Battery ensures these devices remain functional with minimal maintenance.


🚁 Micro Drones & RC Toys

Micro drones and RC toys are particularly demanding on batteries because they require lightweight yet high-energy power sources to achieve extended flight times and quick responsiveness. The 3.7V 400mAh LiPo Battery is a preferred choice for:

  • Micro racing drones that need fast bursts of energy for agility.
  • Toy helicopters that rely on stable power to maintain lift.
  • Mini RC cars and other remote-controlled vehicles.

Thanks to its high discharge rates (up to 1C) and stable voltage, this battery can deliver consistent power output, ensuring smooth performance. Drone pilots especially benefit from its lightweight 8g design, which reduces overall takeoff weight and improves maneuverability.


🎮 Portable & Wireless Gadgets

In today’s digital age, small portable gadgets and wireless electronics dominate our daily lives. The 3.7V 400mAh LiPo Battery finds application in a wide variety of such devices, including:

  • Mini Bluetooth speakers
  • Wireless game controllers
  • Handheld electronics like translators or pocket printers
  • Portable health devices such as digital thermometers

One of the key advantages here is the low self-discharge rate of the battery. This means that even if a device is left unused for weeks, the 3.7V 400mAh LiPo Battery retains most of its charge, allowing users to power on their devices immediately without waiting for a recharge.


Advantages Over Other Battery Types

🔋 Higher Energy Density

One of the standout features of the 3.7V 400mAh LiPo Battery is its superior energy density compared to older battery technologies such as NiMH (Nickel-Metal Hydride) or alkaline batteries. Energy density refers to the amount of energy stored in a given volume or weight. Since LiPo batteries can pack more energy into a smaller form factor, devices powered by them can remain compact and lightweight without compromising on runtime.

For example, in wearables or micro drones where space and weight are critical, using a bulky NiMH or alkaline cell would severely affect performance. By contrast, the 3.7V 400mAh LiPo Battery provides enough capacity to keep devices running longer while maintaining portability.


🌍 Rechargeable & Eco-Friendly

Unlike disposable alkaline batteries, the 3.7V 400mAh LiPo Battery is fully rechargeable, which significantly reduces environmental waste. With a lifespan of over 300 charge-discharge cycles, a single LiPo battery can replace hundreds of disposable cells over its lifetime.

This not only saves money for users but also contributes to sustainability by reducing the number of batteries that end up in landfills. For eco-conscious engineers, hobbyists, and companies, this rechargeable nature makes it the ideal choice for powering IoT devices, drones, and portable electronics.


⚡ No Memory Effect

A major drawback of older battery chemistries, particularly NiCd (Nickel-Cadmium), was the memory effect—a phenomenon where the battery “remembers” a lower capacity if it is recharged before being fully discharged. Over time, this leads to reduced performance and efficiency.

The 3.7V 400mAh LiPo Battery completely eliminates this problem. It can be recharged at any state of discharge without losing capacity, which makes it extremely user-friendly. Whether you recharge it after partial use or full discharge, the battery maintains its rated 400mAh capacity throughout its life cycle. This ensures consistent performance for wearables, wireless gadgets, and drones.


🛡️ PCM Safety Features

Safety is critical when dealing with high-energy batteries, and this is where the Protection Circuit Module (PCM) inside the 3.7V 400mAh LiPo Battery plays a vital role.

  • Overcharge Protection: Prevents damage from excessive charging voltage.
  • Over-Discharge Protection: Stops the battery from being drained below safe voltage levels, which could otherwise shorten lifespan.
  • Short-Circuit Protection: Cuts off power in the event of a direct short, preventing potential hazards.

These built-in safeguards make the 3.7V 400mAh LiPo Battery not only powerful but also reliable for use in sensitive electronic applications where safety cannot be compromised.


Precautions for Safe Use of the 3.7V 400mAh LiPo Battery

Safety is one of the most important aspects when handling any lithium-based power source. The 3.7V 400mAh LiPo Battery is a high-energy device, and while it is designed with PCM protection for reliability, users must still follow best practices to ensure maximum performance and safety. Below are the detailed precautions every user should follow.


🔒 Storage Guidelines

  • Temperature Control:
    Always store the 3.7V 400mAh LiPo Battery in an environment between 0°C and 50°C. Extreme cold can damage the electrolyte inside the cells, reducing capacity, while excessive heat can accelerate chemical breakdown and even cause swelling.
  • Avoid Direct Sunlight & Heat Sources:
    Never leave the battery in direct sunlight, near heaters, or inside a parked car, as trapped heat can raise the internal temperature beyond safe limits. Continuous exposure to heat can cause degradation, swelling, or even leakage.
  • Use Fireproof Containers:
    For additional safety, store LiPo batteries in a fireproof, non-conductive container or LiPo safety bag. These are designed to minimize risk in the rare event of thermal runaway, preventing the spread of fire or damage to surrounding objects.
  • Periodic Check-Up:
    Even when not in use, periodically check the battery’s voltage and condition. Storing the 3.7V 400mAh LiPo Battery at around 50–60% charge is recommended for long-term storage to prolong its life.

🔌 Charging Guidelines

  • Avoid Immediate Charging After Use:
    After heavy usage, such as powering a drone or IoT device, the battery may be warm. Charging a hot battery increases internal pressure and can damage the cells. Always let it cool down before plugging it in.
  • Do Not Charge When Warm:
    Similarly, if the battery is still warm from a previous charging cycle, allow it to rest before starting another charge. This prevents overheating and extends the cycle life of the 3.7V 400mAh LiPo Battery.
  • Use Recommended Chargers Only:
    Always use chargers specifically designed for LiPo batteries with balance charging capability. Using incorrect chargers can cause overvoltage, leading to swelling or even fire hazards. Smart chargers automatically detect voltage and regulate the charging process, ensuring safety.
  • Monitor Charging Sessions:
    Never leave the 3.7V 400mAh LiPo Battery unattended while charging. In rare cases of malfunction, immediate action may be required to prevent damage. It’s also recommended to charge the battery on a non-flammable surface.

⚙️ Usage Guidelines

  • Disconnect When Not in Use:
    Devices left connected to the battery can slowly drain it, even when powered off. Always disconnect the 3.7V 400mAh LiPo Battery when your project or gadget is not in use to prevent over-discharge.
  • Avoid Physical Damage:
    Never puncture, bend, or crush the battery. Physical damage to the casing may lead to electrolyte leakage or internal short circuits. Handle with care, especially during installation in compact devices.
  • Protect Against Liquids & Moisture:
    Exposure to water or other liquids can cause corrosion or dangerous short circuits. Always keep the battery away from humid environments and never attempt to use it in waterproofing experiments unless it is specifically designed for such use.
  • Monitor During Operation:
    Keep an eye on the battery while it’s in use. If you notice swelling, unusual heat, or reduced performance, immediately disconnect and stop using it. Continuing to use a damaged 3.7V 400mAh LiPo Battery may pose safety risks.
  • Dispose Responsibly:
    Never throw LiPo batteries in household trash. At the end of its life, the 3.7V 400mAh LiPo Battery should be discharged safely and taken to an appropriate recycling facility.

Key Benefits Recap

  • High Performance: Stable 3.7V output with 400mAh capacity.
  • Compact Size: 9 × 20 × 25mm, ideal for micro devices.
  • Lightweight: Only 8g, perfect for drones and wearables.
  • Long Cycle Life: ≥300 charge/discharge cycles.
  • Safe & Reliable: PCM protection included.
  • Wide Applications: IoT, drones, toys, wireless gadgets.

Conclusion

The WLY902025 3.7V 400mAh LiPo Battery by NDB&C BY LOFTY AGROTECH is a high-performance, compact, and reliable energy solution for modern devices. Whether you are developing wearables, building micro drones, experimenting with IoT projects, or powering portable gadgets, this battery delivers the right balance of power, safety, and durability.

With its PCM protection, lightweight design, and long cycle life, it stands out as one of the best options for engineers, innovators, and tech enthusiasts looking for sustainable energy storage.

By choosing the 3.7V 400mAh LiPo Battery, you are investing in performance, safety, and the future of compact energy solutions.


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