This was their emailed response:I've just taken my Neotec apart (as far as I could) and I really can't see how you could install a battery in there. Besides, would that not compromise the integral safety cushioning that the helmet provides?
What exactly did Sena say?
Has anyone installed their battery into their helmet?
"Dean, May 02 14:31 (PDT):
Hi,
Thanks for the email.
It is recommended that you mount the battery outside rear of the helmet. However, if you have a space to mount inside you have this option.
Sincerely,
Dean
Technical Support Engineer
Sena Technologies, Inc."
The battery is very slim and I am hoping that I can find a sliver of space to tuck it inside. (Haven't tried yet, as I only got my intercoms in today's post). But if it won't fit, I don't actually see the batteries being mounted on the exterior as an issue, given the size/low profile. But I will take some time to hide the wiring.

It would be nice to see how the 5 looks on the Neotec.
...and b) the 'chunkiness' means that you can very easily use it in the move - the disadvantage of the 10R is that you have to 'site' your gloved fingers on the unit first and then find the right one of three buttons to press - with the original units its all in the jog wheel which is dead easy to hit or twist without fiddling around.
)