Support your sustainability goals

Corporate branding available for larger orders

The perfect corporate gift or sustainable item for employees and clients

Developed in the Netherlands by entrepreneurs from VU University Amsterdam

CES Las Vegas 2025 Innovation Award Winner

Leo won a CES Innovation Award at the world’s largest electronics event in Las Vegas. The Dutch Ministry of Economic Affairs compares this recognition to “winning a gold medal at the Olympics for electronics tech innovation.”

EU Green Challenge Winner

Postcode Lotteries Green Challenge is one of the biggest international competitions for smart solutions towards a sustainable future.

Raised over €250,000 and supported by 2,700+ people on

Trusted by Postcode Lotteries and by daily users in over 60 countries

Customer Reviews

Excellent device.

I have given support to this idea since the kickstarter opening.
I have been using Leo since a few weeks now and it is working great. Especially used during the night without any worry.

Thank you to the team

Xavier

Dispositivo ricarica LIION

Buongiorno,
ho ricevuto il dispositivo di ricarica (prolungamento della vita della batteria - Smartphone), a dirlo in due parole È SEMPLICEMENTE FANTASTICO. FUNZIONA ALLA GRANDE.
Lo utilizzo per i miei cellulari (Samsung Galaxy S20FE; Samsung Galaxy S22 Ultra ; Samsung Galaxy S24 Ultra, ho già notato subito dal primo utilizzo, che la batteria ha una durata più lunga.

Cordiali saluti.
Carlo

It works well

It does what was specified. In the default setting it will charge the phone battery to 85-90% and then not only stops charging but also shuts down the charger, so no longer do all these smaller charging actions at 100% occur that cause the battery to deteriorate. Since I use the LEO, some 4 months now, my (iPhone) battery status has not dropped, not even a single %. And before the LEO it dropped 5% per quarter. Only my experience, but the technically very logical.
The app works, but is quite rudimentary. Yet it does the job.

It works like a treat!

I received it a few days ago. It works a treat!

Congratulations on a successful product release!

Kind regards,
Ryan

Happily using the products

Got them, and happily using the products. Thank you so much!

Liking it

...liking it so wondering about purchasing another. Thanks Bill

Does exactly what it should

As the title says :) It automatically stops charging all my devices at approx. 90%, even my galaxy 6 smartwatch on its wireless charger. I got mine in the Kickstarter campaign and just ordered one for my girlfriend, too.

Nice product

It looks great. Design and packaging really sleek. After I followed the manual it worked easy for automatic limiting the charging. Also like the safe Mode for travelling:)

I already use the Leo daily

I am neither a digisaur nor a wizzkid, but this device is really easy to use. I haven't even gone through installing the app so far, but I already use the Leo daily. It gives me a little bit more peace of mind not worrying about overloading my batteries all the time.

It's working so good

The Leo arrived at home the last month, and it's working so good.

Best regards,
Alvaro