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True or false ? Four updates on your smartphone battery

2020-02-19T16:15:07.804Z


Most of the information known to the general public is based on the technical characteristics of first generation devices. He is


It is sometimes the anxiety of the end of the day: running out of battery and being deprived of your dear smartphone during a journey by public transport. So to optimize its recharge, the ears always stand up when a remark from a colleague or a friend more or less knowledgeable.

There are often more or less wise and generally dated advice, let's try in 2020 to debunk a few untruths.

You need to completely drain your battery to fully recharge

False . The current terminals are all equipped with Lithium-Ion (Li-Ion) batteries with cells that store and store electricity. Those of the previous generation, called Ni-Cd or Ni-MH, memorized their state of charge and, when it was incomplete, actually needed to be emptied to restart a full charge cycle.

Lithium-Ions do not memorize the charge level and therefore do not need to be fully discharged to optimize the next recharge.

“It was indeed true for smartphones sold 10 years ago. We did not find any significant impact on current batteries during our studies, ”confirms Jean-Charles Frelier, head of smartphone testing at the Fnac test laboratory.

Leaving to charge overnight damages the battery

False . "The Li-ion batteries of current smartphones contain a charge control system (" Battery Management System "in English), which disconnects the battery from the charger once the 100% charge is reached", explains Spencer Pangborn, Marketing Director from Moshi, a manufacturer of smartphone accessories.

This electronic circuit will thus ensure a continuous charge until reaching 90% with a constant electric current. Then the rest of the recharging is done with the current voltage, that is to say that the electric current sent into the device approaches zero.

"Even when it is fully charged, the battery remains at this current voltage which no longer charges and therefore does not carry the risk of overcharging", agrees Evan Zhou, Product Manager at the Chinese manufacturer OnePlus.

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"It also makes no difference whether it is a wired or wireless charge," says the expert at Moshi.

The phone left on while charging while you sleep will consume electricity. But it does not draw from the battery, rather from the electrical outlet, and in small proportions.

Percentage displayed may differ from battery charge

True . Beware of non-contractual percentages. As the end of recharging is done with a different electricity, the current voltage, the last percentages of battery take more time because the electric intensity decreases in the passage.

Everything obviously depends on the models but the software of the devices tends to consider that the recharge has been complete beyond 90%.

"Between the 100% displayed by the smartphone and a physically really full battery, there can be an hour of difference in charge," confirms Jean-Charles Frelier of the Fnac's Test Laboratory.

Uncertified chargers are dangerous

True and false . This is an unstoppable marketing argument: using a charger other than the original one implies a risk of malfunction. It would even void the warranty.

No, it is possible to buy a power cable and its plug from an accessory manufacturer but you would have to spend a few more euros to buy a product certified and European safety standards.

Independent manufacturers are conducting tests to avoid overloads and the risk of fire starting. They even pay a large annual fee for some to Apple in order to sell the proprietary "Lightning" connectors.

This cable for iPhone sold at 3 € in the metro immediately becomes suspect. “Nothing tells us that these fake chargers do not continue to deliver electricity while the battery is full. There is then a risk of explosion ”, underlines Jean-Charles Frelier, of the Fnac test laboratory.

Source: leparis

All news articles on 2020-02-19

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