limit phone’s nighttime charging to extend battery lifespan

Keeping Your Phone
Fully Charged Overnight
Kills Up to 20% of Its
Battery Capacity
in Less Than
a Year.

Real life consequences

- after a year -

  • 20% or dead battery by noon
  • Missed calls and messages
  • Gradually-increasing frustration
  • Limited app performance
  • No power in possibly dangerous situations
  • Expensive repairs
  • Risk of battery swelling and fire

Our brand new


fixes battery life.

really smart charging

How? What is it?

Chargie is an easy to use
power management system
that stops phone
battery degradation

by smartly limiting
nighttime charging.

And it's actually the only
commercial device that does this.

Each Chargie will save you

– the cost of a new phone every 1.5 years
– carbon-consuming resources
– frustration over an expensive phone’s battery
not lasting as expected when you need it most

By using it, your phone battery will still be working fine after 5 years.
It's that simple. And it's based on science.

this should set the bar for responsible usage of tech

A Tesla owner's review

Miles Forrest
Miles ForrestTesla owner, ExCeL London customer
Read More
Met the founder Ovidiu at a science fair in Excel London. He knows his stuff and we bought two Chargies. Now I've just got 3 more arrived today in the post from Romania. One for work, home office, kids etc. I use it like I use my Tesla, charge to 80 or 90 most of the time which is fine on a Samsung S10. Only charge to 100 if I'm doing a long day out. I haven't found any other product /app out there which does this.

Thank you, Miles.

short guide to simplicity

How do I use it?

1. Connect your Chargie between
your regular charger and phone or wireless charging pad


2. Install the Chargie app
from Google Play

3.Use the app to connect to it and set the desired charging level by sliding your finger on the battery icon.

4. Go to sleep

5. Chargie's closed loop system takes control of the power flow following an algorithm that decreases battery temperature and voltage related stress, throughout the 8 hours of nighttime charging.

6. Just forget about it - the app runs in the background and will auto-connect to the last Chargie next time you plug your phone. You only have to check it's active before plugging.

Now, if there was a phone whose battery health would last for 5 years,
would you pay
$30 more for it?

But that phone doesn't exist yet.

So having the next best thing
makes perfect financial sense

Your phone
was expensive.

Make it last.

SALE !!!

We've decided to keep this sale for a little longer. Take advantage!

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Verified customer reviews

why chargie works

The Science Behind

image (c) Apple

A typical smartphone charges up to 100% and then keeps the battery in that very high state (around 4.35 volts) until the user disconnects from the mains.

Indeed, the battery is protected from thermal runaway by its internal circuitry (it would catch fire otherwise), but the measures taken happen at extreme values, and are not optimized for a long and sustainable battery life.

Holding a 100% charge for many hours at a time induces a voltage- and heat-related stress and damages the internal lithium lattice of the battery, at a molecular level (see reference).

Limiting the charge level below 100% or releasing it once it has 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 (tables 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 has recently implemented a similar but way less configurable function in iOS 13.

However, most phone manufacturers haven’t and probably never will.

Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage. A battery dwelling above 30°C (86°F) is considered elevated temperature and for most Li-ion a voltage above 4.10V/cell is deemed as high voltage. Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling. Table 3 demonstrates capacity loss as a function of temperature and SoC.


The damage each cycle does to a battery depends on the depth of discharge, time of charge and temperature. Lithium Ion units are very sensitive to depth of discharge and temperature. 

The lower you go, the worse it gets for the battery, because the internal resistance of the cell rises and energy is lost through heat (just like a classic lightbulb). 

Some papers refer to cycles as a continuous charging process from zero to 100%, while others add mini-cycles (like from 30% to 50%) to this equation, but they’re not equal in terms of battery degradation, since five 40-60% cycles don’t do the same harm as one 0-100% cycle and then keeping it fully charged. [1]

Besides limiting the charging process, Chargie’s hysteretic algorithm (see what hysterestic charging is) makes sure that even if you charge to 100%, the process is stopped until the battery discharges down to 95%, and then restarted. 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 will apply the hysteresis you set, and the practice will yield much better results in the long run, from both a battery 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.



Features and Tech

Chargie relies on Android, Bluetooth Low Energy 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:

Chargie helps you Reuse and Recycle

Prolonging the life of your stuff is the best thing to start caring about

The electronics industry is one of the greatest sources of pollution worldwide, and it’s affecting the health of everyone, including yours and your children’s.

After you upgrade, donate your old phone to someone in need, who’s not as picky with tech as you are.

That person may be using it for many years ahead, and will not buy a new one!

use cases

What Customers Use Chargie For

Private use

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 life will be like when it was 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.

Also, a 14yo girl from Kazakhstan died on Sep.30, 2019, because the phone's battery under her pillow exploded (news reference).

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 can 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.

Business use

Always-Charging Phones

Demo phones and tablets in shops usually stay connected to the mains, and that's what destroys their batteries. After a few months they start swelling or even catch fire, in severe cases.

Chargie automatically ensures the battery is only charged partially, hence the damage will be almost zero and the risk of fire is null. This also increases 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.

The Innovative Chargie App

The Chargie app sits at the core of the device’s services. Now it only supports Android phones and Chromebooks, but will soon be on iOS, MacOS and Windows.

Service & Warranty

Great Warranty

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

If for whatever reason you’re not satisfied with Chargie within 45 days of your order, just return it and ask for a refund.

Message from the inventor

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 what the whole game is all about.

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

The wonderful Chargie project adventure

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