Lead-acid batteriesLead-acid batteries should never be deeply discharged, but always be operated under the highest possible voltage. Deep-discharged batteries, for example, by total "run empty" or by long storage, without charging (eg over winter period) can force lead batteries getting sulfated and damage the cells. This process is irreversible in many cases resulting in total loss of the battery.
Do not think you "waste" many charge cycles by recharging the lead-acid battery more often although this is not "emptied " completely - this is totally wrong! For the specified life by charging cycles, so-called full cycles are meant. This means that if your battery is low 50% and then fully recharged, this equates to a half charging cycle. Twice recharge accordingly means full cycle then.
We therefore recommend recharging the battery from a discharge of 25%. But then always until the charger completely finished loading. This guarantees reaching a maximum allowable voltage of the cells.
During the winter or long-term storage of vehicles with lead-acid batteries, it is imperative charging at least once a month until charging is complete.
Lithium batteriesLithium batteries should never be deep-discharged, this damages the lithium cells irreparably. All lithium batteries should always be stored at medium charge (if possible). If a battery is not needed for a long time, please do not fully charge it before storage - this puts the lithium cells in unnecessary "stress" which in the long term can lead to a shortened life. If you have the choice when using the battery, we recommend in principle not fully charge it, but always keeping it in the medium voltage range when in use. Of course, the battery can be fully charged, for example, when driving long distances - it is only technically for a lithium battery the best, not to do this to really get the maximum in performance and life out of the battery.
The life of lithium batteries is given in charging cycles. Do not think you "waste" many charging cycles by recharging the lithium battery more often, even though it is not "emptied" - this is completely wrong! For the specified life in charging cycles so-called full cycles are meant. This means that if you discharge your battery by 50% and then recharge it fully, this equates to a half charging cycle. Twice recharge accordingly means full cycle then.
We recommend recharging a lithium battery when reaching 25% residual charge up to about 75% charge state. Of course, the battery can be fully charged for long distances - see above.
During the wintering or long storage of vehicles with lithium batteries, it is absolutely necessary to recharge them at least once a month to about 60% charging state.
For lithium batteries, use only chargers approved and recommended by the manufacturer. Charging with too high charging current to recharge faster can irreparably damage the lithium cells and in the worst case lead to a fire or explosion.