Biggest battery size/output for K12

[tobyd]

Hi,
My partner has changed jobs and works close to home so the battery is getting little time to recover after starting especially in the cold weather.
Whats the biggest size/output that will fit a 2003 1.2?
Will a 075 diesel battery fit?
cheers
Toby

 

[tobyd]

Have put a larger battery on as there is plenty of room as it doesn't sit as I thought.