I've been watching an ARRI 2C on ebay. Looks nice, but the seller has a Cine 60 "battery pack" attached to the base of the camera which the constant speed motor/handgrip is also sitting on.
I contacted the seller and was told that it's a battery pack, but it looks more like a charger to me. But doesn't the motor need to be connected to a power cable during operation, in any case? So what is the purpose of this other than making the camera bulkier?
I'm probably missing something very obvious. Hopefully, someone can enlighten me. Here are two photos: