Does anyone know of a book or website that is up to date and explains in detail about the different types of batteries, how to decide which type to use where, acronyms, how to charge them, etc. I also could use some information about the new electric motors being used for electric flight these days.

I used to fly R/C planes about 40 years ago using Orbit 10 ch. reed equipment (bring any memories back for anyone out there?) in a Taurus with a Super Tigre 56 (the only name of a non-scale plane I can remember). I really like the idea of electric flight and will be getting back into the hobby very soon. I prefer doing my homework before jumping into anything so some help would be appreciated. Among all the questions I have, is this one -I've seen terminology about 9c or 10c discharge ratings - what is that all about? I do have a little electronic experience so I figured out the 2s3p terminology as 2(series)3(parallel) but most of the rest of it is new to me. Any suggestions?

Thanks