XRAY - Model racing cars

Hello again folks,

The topic of my question this time is batteries. I bought the LRP Flow X TC ESC for my Xray T4 and it has an input of 7.4V. I was searching a lot for good 7.4V batteries on the market but most of them were either discontinued or sold out. I find all the time awesome 7.6V batteries and few 7.4V batteries that I don't really like. Will those 7.6V batteries fry my ESC or reduce its lifespan? Is that 0.2V a really big difference?

Also I would like to know if EFRA allows batteries to be charged above 8V. Some people tell me this is forbidden but I found some pdfs on the site of EFRA that say batteries can be charged up to 8.4V so what's up with that?

Kind regards,

Boris