Why does a twin charger only charge one battery at a time?

trimble charger dual battery slot   Dan trimble charger dual battery slot

I have two grey batteries for my S3 total station I have the two slot grey charger When I charge one of the batteries

It can be powered by AC power or vehicle battery The Dual-Slot Charger Kit consists of: Charger dual-battery slot Power supply for charger  Dual slot battery charger with power supply and cord for your Trimble optical instrument batteries and Trimble GNSS receiver batteries (89840-00

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