My 2011 renegade BC 800e-tec won`t start

[Backcountry800]

my ski doo won't start 800 renegade bc e-tec 2011 it have been cold for a lot of days, but it is 0 celsius now and it wont start it only makes an buzer sound what to do?

 

[snowhound63]

electric start? of so boost it sounds like weak battery

 

[Backcountry800]

it is elstart, are charging it now