However, I was amazed at what happened when I was going 70mph on the freeway and stomped on it. With the original battery I would only get relatively weak acceleration from 70mph on.
However, with the battery upgrade I get a really strong pull and acceleration going from 70mph to 90mph. I did it a bunch of times to make sure I wasn't imagining it, and it's really noticeable.
In the past I have described the car as a glorified go-kart because I would only get really impressive acceleration from 0-70mph. Anything over 70mph was pretty weak. I don't know if there was something wrong with my car before, and now it's fixed, or simply that the new battery is capable of delivering a whole bunch more power at higher speed. Either way, I love it!