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Bonjour (the limit of my french!),
The Ion-x2 (a 90 sized electric heli) is pretty new so there are not very many setup examples out there yet. The typical setup will be 12s, so you will need 2x6s1p 3700-5000 mahr, +20-25C battery packs to run it.
The gearing will depend on the type of motor you select. Most would be using an Actro 32-3 with 12s, and ~ 11.0 to 12:1 gear ratio imop.
I'm sure if you contact Minature Aircraft (MA, for short) they can advise you. Do a few Google Searches and I'm sure you will find them.
I have 2 of the original Ion-x's (both on 10s) and love them. I'll probably upgrade one of them to a x2 soon.
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx