limit phone’s nighttime charging to extend battery lifespan

Your Phone Battery Loses Capacity Every Time You Keep It Fully Charged.

All night.
Every night.


  • Gradually-increasing frustration
  • Missed calls
  • No power in possibly dangerous situations
  • Expensive Battery Repairs
  • Extra power pack to carry around
  • Unsustainable technology
  • Risk of battery overheating

Meet Chargie.

redefining phone charging

What does it do?

Chargie is a USB device that stops phone battery degradation by automatically optimizing the charge process,
while you sleep.

Technically speaking, its app and hardware pull the plug when the battery reaches your desired percentage, thus greatly increasing its lifespan.

It's not magic, but science (see below).

simple is magic

How Do I Use It?

1. Connect the Chargie between your charger and phone.

2. Install the app

3. Connect to Chargie and set the limit in the app.

4. Go to sleep

Chargie’s hardware and software will communicate through Bluetooth and will cut power at the level you select by dragging the slider in the app.

Effect: the lifespan of your battery will be hugely extended, and safety will be maximized. Sony already uses a mild version of this charge limiting technique, Apple is about to implement it in the future version of iOS (See references [3] and [4])

But most phone manufacturers don’t. And probably never will.

Even if you choose to charge to 100%, our hysteresis algorithm performs an optimized, stress-free charge for both long term battery life and daily phone usability.

No root access needed, because power gets cut off externally.

Chargie is the only system on the market that has the ability to limit a stock phone's charging process to save its battery.

Chargie is a device
mindful people.

It's a tool for those
who dig concepts like
long term technology usage,
sustainability and

August Sale

– Shipped by Low Cost DHL Express (~2-4 days) –

Chargie – the phone charge limiter – Founder Edition – Blue

All battery manufacturers state that charging your phone every night to 100% and keeping it this way for 8 hours stresses the battery and shortens its lifespan.

Chargie is the only Bluetooth switch that physically halts the charging process to your chosen value (the lower, the better), so you can actually use your phone for up to 10 years without noticeable battery drop.


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the science behind

How Chargie Works

In a regular phone, charging is typically driven up to 100% and then kept at that very high state (around 4.35 volts) until the user unplugs it. Indeed, the battery is protected from overcharging, but not in an optimal way.

Actually, the way most phone manufacturers charge their devices’ battery is far from optimal. They just don’t care much about lifespan, since phones are thought to be disposable after the next version gets released.

Nighttime Charging

Keeping the charge level to 100% every night induces a voltage-related stress and damages the internal lithium lattice of the battery, at a molecular level.

Limiting charge below 100% or releasing it once it’s topped up has hugely beneficial effects for the lifespan of the battery. An optimized charging process can take a normal phone battery from 250 cycles to more than 1000, before it shows signs of degradation (table courtesy of batteryuniversity.com [1]).

This has been well documented by the scientific community. Electric car manufacturers like Tesla already avoid charging to 100% by default. They say it’s fully charged, but it’s actually less. Microsoft has even implemented charge limiting in Surface tablets [1][2], Sony in latest-generation Xperia and Lenovo in laptops. Apple recommends you do not charge your phone fully every night.

Chargie does more than charge limiting

Besides limiting the charging process, Chargie’s hysteretic algorithm makes sure that even if you charge to 100%, the process is stopped until the battery discharges down to 95%, and then reapplied. This is way less stressful for the battery and dramatically prolongs its lifespan. You can adjust the allowed discharge percentage manually from the app’s Settings menu.

Practically, it is best if you only charge to 90%. If you do so, Chargie’s default hysteresis is 1%, and will yield much better results in the long run, from both a lifespan and daily usability perspective.

Ideally, the lower the daily charge, the better it is for the battery.

By applying hysteretic charging, the risk of battery swelling and fires is greatly reduced (unless the battery itself has a physical defect). Read more about it on Google.


the most frequent use cases

How Chargie Can Help You



Phone lifespan extension

Chargie has been designed to protect batteries. Just juice your phone through it and in a few months you will see the difference:

- Your battery will hold a charge like new
- We are working on implementing a Chargie Certification Program, so you can have a higher resale value, should you decide to sell it.
- After you upgrade to a new phone, you can safely give a perfectly working gift to someone in need.
- You can use the same Chargie on your next phone, too.

Charging safety

There have been cases where people who were sleeping with phones under the pillow died, because the battery caught fire, like Nazrin Hassan, last year.

According to the National Sleep Foundation, studies found that around 45 percent of parents and 30 percent of children sleep with their cellphone or tablet in their bedroom with them, oftentimes leaving the devices turned on and plugged in throughout the night (link here).

With Chargie, those devices stay charged at 50% and the risk of fire will be zero.

It is therefore very useful to have your charging limited in time and energy. Fire risks will be greatly mitigated.

Data storage security

People often keep their data on NAS storage, or their devices connected to routers in their homes.
Chargie's transparent USB connection can help secure your data. Just activate Lamp Mode with Proximity Sense, connect your hard drive through a Chargie stick, and exit the room. Your data will be safe, as the hard drive or USB stick will shut down automatically (and electrically) when your phone is out of range. When you come back, the app will connect seamlessly to Chargie and the data storage will come back to life.

Proximity-activated switch

If you have an LED lamp or a fan that only needs to work while you're at your desk, just connect it through a Chargie and activate "Lamp Switch" and "Sense Proximity" in the app.
When you leave your desk, the switch will turn off automatically. When you get back - you've guessed it.

Phone kiosks

Demo phones and tablets in shops usually stay connected to the mains, and that destroys their batteries. After a few months they can begin to swell or even catch fire, in severe cases.

Chargie will automatically ensure the battery is only charged partially, hence the damage will be almost zero and the risk of fire is null. This will also increase the resale value of those demo phones.

Surveillance equipment

Phones and tablets are used as surveillance equipment in many cases (like that project that protects forests from illegal tree cutters).

They often run on solar power, but their batteries stay charged to 100% all the time. Hence the risk of swelling, fire and general malfunctioning of the system.

With Chargie, those devices stay charged at 50% and the risk of fire will be zero.

Taxi / professional navigation

Professional drivers (taxi, Uber, trucks, pizza deliveries) use tablets and phones as navigation systems all the time. They stay charged up for thousands of hours every month, placed in direct sunlight.

Batteries get very hot, very often.
Fully charged lithium ion batteries and high temperatures are a very dangerous combination.

Chargie can do away with all that by limiting the charge to some 50%. This way, battery damage is greatly reduced and the risk of catching fire is eliminated.
Fleet management is on its way to the app soon.

Daisy chain security

If you need two or more persons to activate a hidden and locked USB device, just daisy chain two or more Chargies.

The USB device will not come online unless everyone is in the room.


Features and Tech

Chargie relies on Android, Bluetooth and a powerful 4.8A electronic switch to deliver current from the charger to the phone, and to stop it when the charge level has reached the desired value.

Here are some of its unique characteristics:


What Real Customers Say

"The product is a great idea! I'm tired of replacing batteries because of wearing them out by charging them to 100% all the time. No one is currently doing what you're doing - other solutions all require rooting the phone, or things like WiFi smart plugs and IFTT."
Mark McKenzie
Engineer, UK
"Did some research on the internet. There are a lot of "experts" out. Fact is overcharging to a too high voltage and heat are the Li Batteries enemies. Modern devices are somewhat protected against overcharging but your Chargie is the only device I found which do it right."
Georg Macku
Maker, Austria
Works perfectly! Smart idea and keeps battery con fully charging at night. Only gripe is the Chargie notification showing all the time, you can turn it off but it'd be better if it appeared and disappeared as needed. It took a while to find this device (I think I followed a link in a forum) so I think it could be marketed better as it's a really useful device.
Mitul Patel
Online Customer, US
It works just fine. Chargie can not only make your battery live much longer, it also prevents battery fires and explosions. Set it to 60% to make the battery last almost forever, but even settings like 80% will already extend the life span so much that you will probably discard your phone before its battery loses too much capacity. Root is not needed.
Hans Georg Michna
Customer, Germany

- you can check these reviews are real by visiting the Google Play app page -

Service & Warranty

Great Warranty

If you use it properly (don’t overload), Chargie will last a lifetime. However, should you have any issues in the first 2 years, we’re here to help by repairing or replacing your defective unit.

If for whatever reason you’re not satisfied with Chargie within 30 days, just ask for a refund.

Made in Europe

*if ordered during a weekday (Mon-Fri, 8am – 3pm EEST), except local legal holidays

*DHL free shipping for orders of at least 5 units

Photo Gallery

Message from the founder

Building something from scratch is not an easy thing.

You don’t really know what it’s going to look like, how it’s going to behave, what the real challenges are, but that’s the game.

No matter how much you think you know about your product, truth is you only have an idea about it.

Your product grows up with you, takes you back and forth, left and right. It hits you against the wall and then comes back even better, each time.

That’s why creativity and entrepreneurship are embraced by a few crazy ones who either have the guts or the unconsciousness to pursue their lifelong dreams at the risk of everything.

Money is just a tool for them, anyway.

Ovidiu Sandru, founder
Lighty Electronics

Photos (c) Ovidiu Sandru, Alena Koval/Pexels

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