Charging to 100%
Batteries are put under more stress when charged to 100%, accelerating battery wear.
Leo:
The Battery Life Extender
Plug & play smart charging. As much as 50% longer battery lifespan.
Let’s save our batteries,
for our wallet and for our world.
Each year, over 5 billion devices are produced, but nearly a third become waste due to aging batteries.
62 million
tons of e-waste in 2022 alone.
22%
of it was properly recycled.
Source: Global E-waste Monitor 2024.
What causes battery aging?
Overnight charging
Not only do batteries charge to 100% soon after you fall asleep, but they stay under high chemical stress for hours.
Fast charging
Faster charging contributes to battery wear and increases temperatures, which further accelerates battery aging.
Meet Leo:
The Battery Life Extender.
Stops at about 90%.
Leo automatically sets an optimal charge limit at approximately 90% for all your USB devices. Maintaining your batteries within the range of 10% to 90% can already significantly extend their lifespan.
Leo stands upright with its light white, among a phone, a game controller, headphones, a power bank, an earbuds case and a smartwatch. A battery above them fills to about 90% and stops.
Takes a break at night.
During night charging, Leo regulates the charging speed and schedules timely breaks, so your batteries spend less time at a high charge and voltage.
Leo lies flat on a bedside table with its light breathing white. A phone lies face down beside it on a cable, under a crescent moon.
100% when you need it.
Ghost Mode charges normally to 100%. You can still opt for a fast charge when necessary, and there's no need to unplug Leo.
Leo tilts forward on wheels like a car speeding down a road, with its light blue.
Safe on public chargers.
Safe Mode blocks data transfer while charging, for public charging points on the go.
Leo stands upright inside a faceted shield with its light green. Data lines from the sides stop at the shield.
From Leo owners.
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.”
1 / 7
In the news.
All news
FeaturedEngineers Online · December 8, 2025
(opens in a new window)Dutch startup Liion Power wins award after award and is scaling up in Europe
De Ondernemer · September 20, 2023
Flying kickstart for sustainable charger from startup Liion Power
(opens in a new window)De Telegraaf · October 18, 2021100,000 euro prize for device that extends battery life
(opens in a new window)Quest · October 1, 2021Jardo Stammeshaus is the Most Innovative Student of the Netherlands
(opens in a new window)
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