Given the age of another post with similar topic, it was suggested by the 'bot to create a new thread.

I've charged both our RR6+ and our RC5+ST exactly 1 time now.

Same battery rating, same charger rating, except 2 different types of chargers that came with bikes.
RR6+ was charged inside house at 72 degrees ambient temps, and the charger was barely warm. Charged for several hours.

RC5+ was charged in garage at 62 degrees ambient temps, and was so hot I could barely pick it up. Also charged for several hours.

Attached photos. RR6+ charger on left with orange cord.
RC5+ on right with labeling.

Both rated 2A, 120W.

I'm not a fan of the hot charger.

Looks good, but don't think the paint will hold up as it seems to be scratching off easy. May have to do more than scuff and sand down to the bare metal to get it to hold better.