3.7V LiPo Battery LP401740 225mAh for Smart Strap

This is a smart wristband with a built-in 225mAh lipo battery of 3.7V, allowing you to answer calls at your fingertips. When speaking through the embedded microphone, place your fingertips on your ears. Whether you are wearing a classic watch or an Apple Watch, Samsung Gear, or Pebble Time, you can replace the existing strap with it. However, because the LP401740 lipo battery is embedded in the belt, it cannot be replaced.

No one has ever lost a headset in their lifetime. Using this smart wristband equipped with a lipo battery, you can put your phone alone in your pocket, and you can answer the phone by just raising your hand without having to carry any additional earphones or earphones. When you put your fingers on your ears, your fingers can transmit sound and block background noise. Therefore, you can hear apparent sounds in loud places without worrying about other people listening.


Smart Strap Specifications

  • Connectivity: BT/BLE Dual
  • Compatibility: Android 4.4 or newer, iOS 8 or newer
  • Battery: LiPo Battery LP401740 3.7V 225mAh
  • Charging time: 1 hour by Micro USB
  • Waterproof: IP56 Certified
  • Watch Lug: Classic Watch(18-24mm Lug)
  • Sensor: Accelerometer Microphone

Fingertip communication method of smart wristband

When speaking through the microphone embedded in the smart wristband with its own lipo battery 3.7V, you only need to put your fingertips on your ears to hear the caller’s voice.

The operation mode of the smart wristband equipped with a 3.7V lipo battery

The smart wristband receives voice signals from your mobile phone via Bluetooth. After receiving the voice signal, it will generate vibration through its body conduction unit, and the vibration will be transmitted to your fingertips through your hand. Since the transmission is carried out by vibration, it will not cause harm to the human body. When you place your fingertips on your ears, the vibrations will echo to produce amplified sounds in the enclosed space of the ears.

Smart wristband sound quality test with low-capacity 225mAh lipo battery

The blue image represents the original sound signal input, and the magenta image represents the sound signal when received through the fingertips. In voice transmission, the voice frequency range is about 2000 Hz. Within this range, the sound signal passing through the fingertip has little change from the original input sound signal.


3.7V LiPo Battery LP401740 225mAh

Battery Type
LiPo battery
Part Number
Voltage @ Capacity
3.7V @ 225mAh @0.83Wh
UL1571 AWG28 50mm*2


Cut-off Voltage
Thermistor (NTC)
4.0mm x 17mm x 41mm
Charge Temperature
0°C to +45°C
Discharge Temperature
-20°C to +60°C
Storage Temperature
-20°C to +45°C
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