The same applies to charging: If possible, lithium batteries should never be fully charged. This usually happens with smartphones, for example, when they are plugged into the socket overnight.
A charge level between 30 and 70 percent is ideal for the battery. So you shouldn’t charge it to more than 70 percent. And if the battery level has fallen below 30 percent, then it’s a good idea to charge it up to 70 percent again, advises the TÜV.
The good news: some high-quality rechargeable batteries and devices already have a so-called battery management system (BMS) that can control the charging and discharging behavior of the rechargeable battery cells.