Paul from Nexus Racing contacted me and has promised to ship me the correct battery overnight, along with a refund of the overnight shipping I previously paid in which the wrong battery was shipped.
So far, Nexus Racing is correcting the order, and it appears that this was simply a mistake.
I must add, that with all the previous orders at Nexus Racing over the last 2-years, that they were all correct and on time, and this is the first problem I've ever had with them.