Battery Detector with Polymer Lithium Ion 5100mAh 3.8V


Battery Detector with Polymer Lithium Ion 5100mAh 3.8V contains two items: a 1050 mAh lithium-ion battery and a battery power detector to measure the power remain in a li-ion battery.

The li-ion battery is very slim, light and cost effective. It output 3.8 V voltage(nominal). You can also charge it with a specialized charger which has maximum input current 5100 mA and maximum input voltage 4.2V. This battery comes with pre-attached JST 2.0 connector which is handy to click in and out. It also has built-in overcurrent protection to protect against output short circuit. Although, please still take caution and do not abuse the battery in usage. Never charge or use it unattended.

The battery power detector can detect the input voltage range of 3–4.2 volts. There are three JST sockets (JST 1.0, JST 2.0 and JST 2.0) and two battery-soldering pads will adapt to those batteries with a different connector. As you connect a battery to this battery power detector, the on-board four LEDs will indicate remaining power in percentage (0–25%, 26–50%, 51–75%, 76–100%). Another LED will be on if you plug the connector of battery in the wrong way.


1. There is only one battery reliable to be tested at the same time.

2. It will damage this battery power detector as the input voltage is above 9 volts.

3. Never use the battery when it is being charged.

Version Tracker

Product revision Release date Support status Notes
Battery Detector with Polymer Lithium Ion 1050mAh 3.8V(current version) May 2016 Supported None


For battery

  • For Pre-attached JST 2.0 connector
  • Short circuit protection for output circuit
  • Cost-effective

For battery power detector

  • Visual indication on remaining power of a battery
  • Different JST sockets for different battery connectors


For battery

Parameter Value
Capacity 5100 mAh
Nominal output voltage(DC) 3.8 volts
Connector JST 2.0
Maximum Charge Current 2500 mA
Protection Short circuit protection for output circuit
Weight 76 g, the whole package weighs 91 g.
Dimensions 59.8(width)×10.8(height)×59.5(depth) mm

For battery power detector

Parameter Value
Input voltage 3 – 4.2V
Operating current 15 mA
Indication manner Four LEDs (we will detail it later)
Sockets Three sockets for different battery connector and two battery-soldering pads (we will detail it later)
Dimensions 30(width)×25(depth) mm
CN1185 Datasheet
Weight 3.2 g
Notes Only connect a single battery to this module; The input voltage to this module should be less than 9 volts, or it will damage this module.

Platforms supported(only for battery)

Platform Seeeduino/Arduino Rasberry Pi Beaglebone LinkIt ONE
Supported status Supported Not supported Supported(only with Grove Base Cape for Beaglebone v2) Not supported
Notes If no version number is mentioned for a specific platform, it means this product supports all versions within this platform.

Hardware Overview

  • CN1185, a voltage monitoring circuit.
  • Battery-soldering pads, to solder battery’s leads on.

Package includes(main parts)

Parts name Quantity
Li-ion battery 1 piece
Battery power detector 1 piece

Getting Started

Connect battery and battery power detector as in the following image. You can see LEDs are ON indicates actual power remains.


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