<tc>Does my smartphone disconnect the battery from the power supply at the end of charging?</tc>

The answer is no.
All portable devices, including the latest generation of smartphones, that recharge their battery via USB stop the current flowing to the battery after reaching 100%, but continue to keep it at its end-of-charge voltage.

As reported by various industry studies (e.g. 'Battery University', a website published by the well-known technology provider Cadex Electronics Inc.), not disconnecting the charge leads to rapid wear of the battery by decreasing its charge/discharge cycles from almost 500 to about 200.  

Innovative Technology

A team of electronic, mechanical and management engineers developed the ASO (Automatic Shut Off) technology following a two-year study in the laboratories of the University of Rome " Sapienza".

A Made in Italy technology, patented by Witty Srl.

Choose Witty

How does it work?

The ASO is able to read the energy that the smartphone requires from the charger and, thanks to a switch, disconnect the battery from the mains when the device’s energy requirement has been met. 

Unlike all charge controllers, ASO does not read the voltage or capacity of the battery, but analyses the current flow between the device being charged and the charger.

Disconnecting the battery when fully charged prevents it from remaining at its end-of-charge voltage even after reaching 100%, a situation that is extremely damaging to the lithium cell electrodes, thus allowing the battery to lower to a more comfortable voltage and begin its discharge cycle.

It's like relaxing your muscles after an intense workout.

On average how long does a battery last?

According to a survey conducted by Statista, 54% of smartphone owners admit to changing their device when it becomes obsolete and the main cause of obsolescence is an underperforming battery (this occurs on average 1 year and 9 months after purchasing the device).

Only 2% change it every year to upgrade to the next version.

Why don't the big manufacturers have an interest in making batteries last?

It is therefore in the manufacturer's interest to encourage consumers to buy new products.

In addition, replacing the battery of a smartphone or tablet in an authorised centre costs the consumer between 60 and 150 euros, generating a significant mark-up for manufacturers.

<tc>Take care of your device</tc>

Doesn't the protection chip already perform this function?

The answer is no.

This protection circuit does not manage battery recharging but physically disconnects the battery if the voltages or currents exceed the safety parameters.

<tc>Learn more</tc>

Laboraory tests

To prove that our smartphones are not so smart, a lab test was carried out to analyse how a latest-generation smartphone handles battery charging.

In the video test, you can see how the smartphone keeps the battery at its end-of-charge voltage of 4.35V even though it already reached 100% some time earlier.

Later, it is shown that the device is only disconnected from the mains when fully charged thanks to Witty.

How to charge your device correctly

Read our guide with best practices from the experts.

<tc>How to charge</tc>

Do you want to find out more about our technology?

By clicking on this link you can access our detailed scientific research in which we analyze battery chemistry in detail and show you some laboratory tests and analysis
Scopri la ASO ITA versionScopri la ASO ENG version