“Great price, and they do the job. Note that the Ace Battery is more or less square in the cross section, making it a bit taller when it is sitting in the plane. For my eFlite 1.2m P51 that required some modifications to the cowl. Also the EC3 connector doesn't fit in as tight as the IC3 in that plane. I don't think it will be a problem, but it is something I have noted. See more on YouTube at @RCJim.”
