Battery still empty? The TÜV even warns of this smartphone error

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 outlet overnight.

A charge level between 30 and 70% is ideal for the battery. So you shouldn’t charge it more than 70%. And if the battery level has fallen below 30%, it makes sense to charge it up to 70%, advises the TÜV.

The good news: Some high-quality rechargeable batteries and devices already have a battery management system (BMS) that can control the charging and discharging behavior of the rechargeable battery cells.

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