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Battery Charger

TimeCharging percentageCharging current
approx. 5 hoursapprox. 70%max. 30% nominal capacity
approx. 5 hoursscarcely 30%slowly dropping
unlimitedapprox. 3%maintenance charge
It can also be stored like this..


The battery charging devices are found in the workshop and can also have the special function of start assistance. To help the customer quickly, the quick charging of the battery should be possible, even though it's not good for the battery. Hence, such battery chargers are also known as 'quick-start chargers'.


On the far left of the instrument panel the charging current is indicated. With this device up to 380 A (with 24 V 330 A) are possible. This allows us to check how much charge the battery is still taking in. The device measures the increase of voltage and switches itself off automatically if the reference values are not reached inside of a certain time. Fully discharged batteries may possibly, no longer take in any more current. In this case the charging voltage can be also lowered to one third of the nominal voltage. Battery chargers carry out a polarity check before the actual charging process. They test whether in a (even if it's weak) battery, if the correct side shows plus potential and the other side minus. Thus, one cannot misuse this as a mains adapter because a consumer is not a voltage source. The principal reason is however, the protection against confusing the plus and minus poles and also against fully discharged batteries. To do this, one would have to use an older battery charger which does not check the polarity. Using one of these, one could, (for whatever reason) charge even a battery with cross polarity, however, only in order to be able to ultimately dispose of it. Because the device shown above is also capable of giving start assistance, cross-polarity and an incorrect voltage choice is only indicated.

Charging with 10 - 30% of the nominal capacity.


Should modern vehicles contain an large amount of electronics, must this be also considered when charging the battery. Whether a battery must or may be disconnected before charging, and whether start assistance is allowed in the first place, should be taken from the manufacturer information.
It is also to be considered of course, that during charging over and above 2.4 v per cell, explosive gases can be generated. This is important not only for the rooms in which the charging takes place, but also with maintenance-free batteries. 02/13               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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