I can confirm 64GB Kingstons work in the Mobius
I've had one in my front facing wide lense Mobius since August, with my original purchase of a Kingston 32GB in my rear facing standard lense Mobius, no problems with either.
Initial problem I have had was my China Bangood supplied camera came with a faulty battery. They took my word for it [sent photos] and supplied me with a new battery but that took over a month to arrive.
I'll be on the original smaller batteries, and the only problem I found with them was going on holiday for ten days. Come back from abroad popped them back in the car and they would not record. Next time I'm abroad and park at the airport I'll take a mains charger with me and charge them up prior to flying back.
Incidently I've only taken the cameras out of the car the once, as outlined above.
Off top of my head the 64GB was a class 10
Would feel naked [ if you get my drift] if I did not have cameras in the motor