Could it be bad battery?

[yjamous]

Hi Everyone
I'm facing the following problem, and I'm happy to know such forum where I can always find the solutions.

Ok, this problem poped up suddenly. When I start my car, i hear the crank shaft spinning one strong spin, then one very weak spin then it spins strong and the car starts.

Ok, the last maintenance I did was that I had some problem in my A/C and I change the evaborator coil (This is name the mechanic told me it has leakes needs to be changed). But after this change (4 days ago) I did not experience this problem till today.

So, I was wondering could it be my battery is getting old and it needs replacement? Or it's a serious problem?

Many thanks