battery capacity

I have a Como 3.0 IGH with the 530Wh battery. It's good, but on longer rides I sure wish I had more capacity. Specs: Specialized U2-530, alloy casing, state of charge display, 530Wh Can I order / get the 710Wh battery that comes with the Como 4.0 IGH, and use it in my 3.0? Specs...

Has anyone noticed their batteries declining faster than expected? I've had my original battery for almost 2 years now and I've lost probably 40% of the original capacity. I bought a replacement battery (figured it was way cheaper than buying a new bike, plus now I'd have two) and that one...

I built a few simple eBike range calculators last night in an attempt to include the 'impossible to account for' range factors, and spit out a more realistic battery capacity need and range expectation. Please give it a try and let me know if it makes sense and/or how we can improve it...