Hey @Sic Puppy! Thanks so much for this write-up. I'm in a similar boat as you. I own a M2S 750 Kush (that I love) with probably close to 3k miles on it. The battery still works, but the range reduction makes me have to be very conservative on my favorite Saturday morning route, so I'm looking to upgrade the stock 48V 16AH battery. I had been trying to find specs as to whether the speed controller would handle the 52V battery, but seems like this isn't an issue for you. Jenny currently has a 52V 20AH or a 48V 25AH for this application and she suggests the 48V to have superior range... which sounds accurate by the math. Did you notice a significant power/performance difference bumping the Kush up to 52V? I am willing to sacrifice a small bit of range for performance, just wondering what your experience was on that end. Thanks again!