Keeping Your Phone
Fully Charged Overnight
Kills Up to 20% of Its
in Less Than
Real life consequences
- after a year -
really smart charging
What is it?
Chargie is world's only
USB device + App system that
stops phone/tablet battery degradation by smartly
Each Chargie will save you
– carbon-consuming resources
– frustration for an expensive phone not behaving as when it was new
Using Chargie, your battery will still be working fine after 5 years. It’s that simple.
short guide to simplicity
How do I use it?
1. Connect it between
your regular charger and phone or
wireless charging pad
2. Install the Chargie app
from Google Play
3. Connect to the physical Chargie device via Bluetooth and use the battery slider to set the charging limit in the app.
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.
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:
Now, you certainly WOULD pay $30 more for a phone, if you knew it had a battery that will perform like new even after 5 years.
That's for sure.
But that phone doesn't exist yet.
So why not buy something that does?
Real customers' opinions
- These reviews are real. See for yourself by visiting the Google Play app page -
why chargie works
The Science Behind
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).
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 ).
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 , 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. 
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.
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!
What Customers Use Chargie For
Service & 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 30 days, just return it and ask for a refund.
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 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