We often hear that leaving your laptop connected to the mains, when it has reached 100% charge, damages the battery. What is it really ?
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[EN VIDÉO] The flexible battery that has the shape of a cable The manufacturer LG has developed a very special battery: in the form of a cable, it can be folded in all directions or attached, it does not lose performance. © Kwon et al. 2012, Advanced Materials
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Most of us charge our mobile at night. While a full charge takes a few hours at most, the phone often stays plugged in for eight hours or more! However, the smartphones are equipped with a lithium ion batterywhich has the advantage of quickly reload, but is damaged when subjected to too much tension. In addition, overcharging can overheat the battery and in some cases cause its inflammationas we have seen with the Galaxy Note 7 who took fire.
To avoid this phenomenon, however, most manufacturers have equipped phones with systems that automatically stop the current when the charge is full. The problem is that even when not in use, the phone experiences a low discharge. As soon as the drums falls below a certain level, it will again restart the load until it reaches 100%, and so on several times during the night. So many “mini charges” that wear out the battery prematurely and overheat the phone.
The charger alone also consumes electricity
Moreover, the telephone is not the only one to consumeenergy. When the battery is 100% charged and the charger remains plugged in, it continues to absorb electricity. According to Berkeley Laba charger thus represents an average power of 3.68 watts when charging and 2.24 watts when left plugged in while the battery is full. A useless waste of energy.
To increase the duration of battery life, it is recommended to always keep a charge between 30% and 80%, i.e. do not wait until it goes completely flat or charge it to the maximum.
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