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Battery kit 3.7V 520mAh

Battery kit-3.7V 520mAh contains two items: a 520mAh 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 3.7 V voltage(nominal). You can also charge it with a specialized charger which has maximum input current 520 mA and maximum input voltage 4.2V. This battery comes with pre-attached JST 1.0 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 which 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.

Note that there is only one battery reliable to be tested at the same time.

Note that it will damage this battery power detector as the input voltage is above 9 volts.

Note that never use the battery when it is being charged.

Version Tracker

Product versionRelease dateSupport statusNotes
Battery kit-3.7V 520 mAh(first version)May 2016SupportedNone


For battery

  • For Pre-attached JST 1.0 connector

  • Short circuit protection for output circuit

  • Cost-effective

For battery power detector

  • Visual indication to remaining power of a battery

  • Different JST sockets for different battery connectors


For battery

Capacity520 mAh
Nominal output voltage(DC)3.7 volts
ConnectorJST 1.0
Maximum Charge Current520 mA
ProtectionShort circuit protection for output circuit
Weight11 g
Dimensions50(width)×2.5(height)×41(depth) mm

For battery power detector

Input voltage3 – 4.2V
Operating current15 mA
Indication mannerFour LEDs(we will detail it later)
SocketsThree sockets for different battery connector and two battery-soldering pads(we will detail it later)
Dimensions30(width)×25(depth) mm
Weight3.2 g
NotesOnly connect a single battery to this module; The input voltage to this module should less than 9 volts, or that will damage this module.

Platform supported(only for battery)

PlatformSeeeduino/ArduinoRasberry PiBeagleboneLinkIt ONE
Supported statusSupportedNot supportedSupported(only with Grove Base Cape for Beaglebone)Not supported
NotesIf no version number is not represented for a specific platform, it means this product support all versions within this platform.

Hardware Overview

This section shows descriptions for components on batter power detector.

  • CN1185, a voltage monitoring circuit.

  • Battery-soldering pads, to solder battery's leads on.

Package includes(main parts)

Parts name
Li-ion battery
Battery power detector

Getting Started

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

Schematic Online Viewer


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