May I use any charger to charge my batteries?No, because each charger employs a specific charging technology which is matched to a given electrochemical system, e.g. lithium-ion, lead-acid or nickel-metal-hydride. They differ not only in their voltage characteristics, but also in their charging mode, e.g. only quick chargers which have been specially developed for nickel-metal-hydride batteries will ensure optimal charging results for this system. Former Varta chargers for nickel-metal-hydride batteries can continue to be used, but may need more time to fully charge the battery.
Care must be taken when using a charger that does not meet the required charging conditions for a given electrochemical system, even if it carries a label that seems to signal "officially approved". A label of this kind may only state that the device was wired according to the European Electrochemical Standard (CENELEC) or other national standards such as VDE (in Germany: Association of German Electrotechnical Engineers)! This type of label does not make any reference to the charger's suitability for a specific battery system. With cheap devices of this kind, charging nickel-metal-hydride batteries can be both dangerous and lead to unsatisfactory results. This warning also applies to chargers developed for other systems (e.g. lead-acid accumulators).
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