Sorry if this has been asked before but my A7R II arrived today however, my Metabones adapter does not arrive until tomorrow so only been able to update the firmware and charge the batteries. What has come to light after charging my three batteries is how unbelievably slow they charge. Obviously no experience yet but hearing the batteries not lasting very long and the horribly slow charge times I need a better charger? The hähnel ProCube looks like a good solution but any recommendations?