What to watch out for when charging batteries

Batteries do not like extremes: If you always go to extremes when charging and discharging, you will quickly be punished with a shorter service life. But where exactly is the ideal state between full and empty?

Lithium batteries can be found in many places in the home. They are widely used from smartphones to notebooks and Bluetooth boxes to AA batteries. But what many users don’t know: Their service life can be significantly extended by disciplined charging and discharging. This is pointed out by Tüv Süd.

Attention when charging the battery

In general, the energy donors should never be completely discharged, because this so-called deep discharge can lead to dangerous defects within the battery cells, explain the experts.

The same applies to charging: If possible, lithium batteries should never be fully charged. However, this usually happens with smartphones when they are plugged in overnight.

A charge level of between 30 and 70 percent is ideal for the battery. So you should not charge it to more than 70 percent. And if the battery level has fallen below 30 percent, it is good to charge it back up to 70 percent right away, if possible, advises TÜV.

The good news is that some high-quality batteries and devices already have a battery management system (BMS) that can control the charging and discharging behavior of the battery cells. iPhones and many Android smartphones, for example, only charge the battery to 80 percent at night to protect the cells.

Protect against external influences

A rechargeable battery is not a raw egg, but it should always be protected from extreme cold and heat, as well as from moisture, shocks and falls. It is not only improper charging and discharging that is harmful.

Damage to the battery cells caused by physical impact or extreme temperatures can also lead to short circuits and a thermal reaction. If the battery then inflates, there is a risk of explosion, depending on the design and materials used, the experts warn.


TÜV South