newer cars do tend to drain the batterys quicker with all the gubbins on them as they say. if its going to sit for periods could look at getting a ctek battery conditioner, there only about £50 and they keep the battery topped up.
Pop down to your local county batterys, get them to give it a once over for a drain, make sure its charging properly and that the battery isn't duff.
If that all comes back as ok then prob as stated and just not getting enough milage to charge.
Can only echo above, stay well clear of a paddle clutch, twin plates will easily do 500+ if you need to go that far.
Excede or competition clutch rated to the right level will be fine.