3.7V 400mAh 702030 Lithium Polymer Battery Lipo Rechargeable

3.7V 400mAh 702030 Lithium Polymer Battery Lipo Rechargeable

702030 3.7V 400mAh Rechargeable Lithium Polymer (Li-Po) Battery
Product Description

The 702030 3.7V 400mAh Rechargeable Li-Po Battery is a compact, lightweight, and high-performance lithium polymer battery designed for portable electronic devices, IoT applications, robotics, and DIY electronics projects. With its slim 32mm × 20mm × 7mm form factor, this battery provides an excellent balance between size, weight, and energy capacity, making it ideal for space-limited applications.

Featuring a 3.7V nominal voltage and 400mAh capacity, this rechargeable battery delivers stable power output for various low-power electronic devices. The Li-Po pouch cell design offers high energy density, low self-discharge, and reliable performance compared with traditional battery technologies.

This battery is suitable for powering smart devices, wearable electronics, wireless sensors, Bluetooth devices, miniature robots, and custom Arduino/ESP-based projects. It can be easily integrated with compatible Li-Po charging circuits such as TP4056 charging modules for safe and efficient charging.

Key Features
High-quality Lithium Polymer (Li-Po) rechargeable battery
Model: 702030
Nominal Voltage: 3.7V
Capacity: 400mAh
Compact and lightweight design
High energy density
Stable voltage output
Low self-discharge rate
Flexible pouch-cell construction
Suitable for portable and embedded applications
Available with wire leads / connector options
Long cycle life with proper charging and usage
Technical Specifications
Specification Details
Battery Type Lithium Polymer (Li-Po)
Model Number 702030
Nominal Voltage 3.7V
Capacity 400mAh
Energy Capacity Approx. 1.48Wh
Charging Voltage 4.2V
Battery Dimensions 32 × 20 × 7 mm
Weight Approx. 8–10g
Discharge Cut-off Voltage 2.5V – 3.0V
Connector Wire Leads / Connector (Depending on Version)
Rechargeable Yes
Protection Circuit PCM Protection Available

Applications
Arduino projects
ESP32 / ESP8266 portable devices
IoT sensors
Smart wearable devices
Smart cards
Bluetooth accessories
Mini gaming devices
Wireless communication modules
Small robots
RC models
GPS tracking devices
Portable electronic gadgets
DIY embedded systems

Charging & Safety Instructions
Use a dedicated 3.7V Li-Po charging module (such as TP4056).
Maximum charging voltage: 4.2V.
Do not overcharge or deeply discharge the battery.
Avoid short circuits between terminals.
Do not puncture, crush, or bend the battery.
Keep away from heat, fire, and moisture.
Charge only with a suitable lithium battery charger.