The Chargie system consists of a Bluetooth-enabled USB stick that acts as a switch and of an app that controls the switch. 

The app turns the switch on or off, depending on the state of charge reported by the Android smartphone, following a hysteresis charge/discharge curve.

The Chargie app sits at the core of your phone’s future battery life.

Please be aware: The app only works on Android 6.0 devices and higher. iOS is currently not supported.

What you have to do

1. Connect the hardware

Just insert the Chargie stick into your regular wall charger or mobile battery and the phone in the other side of Chargie. It should sit in-between your charger and your phone.

The setup is so simple it’s almost magic.

2. Download the Chargie App

You can download the Chargie app right from the standard Google Play on your phone by searching “Chargie”, or the link below:


3. Let it run in the background


First, you need to know that the Chargie app is essential for the stick to work. It is the one commanding the switch to turn on or off, and the one providing feedback when the battery reaches the desired level.

If you kill the app, the Chargie stick will act just like a regular power cable, because it won’t have feedback from the app anymore.

The system has been designed like this from the very beginning, since you don’t want your phone to not get charged should anything happen to the app.


3.A. Power saving settings

You should disable any power saving schemes your phone may apply to the Chargie app. The app needs to be permanently active and must not be put to sleep by Android or by 3rd party software or manufacturer firmware.

We will make a comprehensive guide on how to do that for each major phone type. However, as a rule of thumb, you can deactivate power saving on a specific app by holding its icon and accessing “App info” (Android 9 and 10) and then Battery Optimizations.

Please try these settings with your phone and see what works for you.

4. Connect to one of your Chargies

When you start the app, it will scan for Bluetooth devices. Make sure you’ve accepted any dialogs when the app starts, as they grant the necessary rights for system to work properly. Take special care of Location Access – it needs to be on, so your Android device can scan other Bluetooth Low Energy devices (Google requirement, your location will not be used by the Chargie app).

Then, just tap on the Chargie you want to use, wait for the Bluetooth icon to turn green and and pass on to the next step.

If you have more than one Chargie device in the list, a down-pointing animated arrow will appear below them. Just swipe down or click that arrow to see the whole list. If not used, it will collapse to just one item after 10 seconds, to save screen space.

After the charge-mode Chargie is set, the app will automatically connect to it when the phone is plugged in next time. If you own multiple Chargies and the next time you use another one, you have to manually select it again. After that, it will default to the last one used.

5. Set your charge limit (%)

After you’ve connected, drag the battery-shaped slider to your wish. You will notice that if the current charge percentage is higher than what you set, the red LED on Chargie will turn off, and so will power to your phone.

5.1. Allowed Discharge

Chargie lets your battery fill up to the percentage you choose, waits for it to drop a certain amount and then restarts charging.

The allowed percentage drop is defined in Settings -> Allowed Discharge.

You can charge up to whatever value you wish, and it’s best if you charge somewhere between 80 and 90%, depending on your daily needs.

There are days when you know you’ll need a full battery. Just set the threshold to 100% and Chargie will still do a better job than if you hadn’t used it, by going to 100% and then performing a hysteretic charge. What that means is it lets the phone discharge the Allowed Discharge amount and then recharges again.

The discharge normally happens very slowly during the night, since it’s being done with the screen off. This lets the battery cool down to room temperature and doesn’t add stress to it, like a normal charger would by constantly topping it up to 100%.

All of this should keep the battery happy and less stressed that normal charging, which surely guarantees a longer lifespan and a more satisfying overall user experience.

6. How to delete a Chargie from your list

Tap the three vertical dots in the top right side of the screen -> Manage Devices.

Click on the red X circle to delete any of the Chargies you connected to in the past. Their name will go back to “chargie”, and you’ll be able to change it whenever you connect to them again.

7. Customize your Chargie's name

For sure that if you have more than one Chargie, you’ll be needing this. The app knows its devices by their Address (the hexadecimal numbers below the name in the list), but it should also be easy for you to recognize them quickly. That’s why you can just tap “Rename” at the top of the screen and give it a new name. It’s that simple.

By default, renaming a Chargie just associates a certain MAC address (the hexadecimal numbers you see below the name) with a name chosen by you. Other phones will see your Chargie named as “chargie”.

If you want your customization to become permanent (until you decide to change it again, of course), activate this option in Menu – Settings:

8. What the icons mean

The icons are very important to understanding Chargie’s state very quickly. They’ve been designed to be intuitive, but just to keep things safe, their meaning is written below.

All of their grey variants show the inactive status. Red bulb means Lamp Mode is active but switched on.

Charge Limiting mode

This is the default mode that the Chargie app is in when you start it. It offers feedback to the Chargie device according to the phone’s state of charge.

USB Switch mode

By turning on this mode, your Chargie will act as a simple on/off switch for USB devices. You’ll be able to remotely control any type of USB-A device from the Chargie app and invent all sorts of use cases where Chargie saves the day.

Red means “off”, yellow means “on”.

Grey means the mode is not active.

Attention: by enabling this mode, you will disable Charge Limiting, which means your phone will charge to 100% or will not charge at all, depending on the state of the switch. To re-enable it, just move the slider at least 1%.

9. Autoconnect

In the beginning, people would order only one Chargie to test it. Then, word spread out and most customers now want a Double or Family Pack, to protect all of their phone batteries.

That is why we have implemented an Autoconnect feature that allows you to switch the Chargie you’re using with another one, seamlessly.

This function doesn’t have its own menu – just an activation check in the Settings menu.

It’s so simple to use it: just pair the app with all of the Chargies you own. It will remember them and the next time it will connect to the last one you used.

However, if it’s not the same every time, the app will detect the new Chargie you’re physically connected to and will take control of it via Bluetooth.

Attention: do not rely entirely on the Autoconnect feature, especially when you have little experience using your Chargie. Due to interference or low Bluetooth signal between the physical Chargie device and your phone/tablet, Autoconnect may not manage to do its task properly and will require manual reconnection.

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