(G) How to check a battery (abarth)

Hi, Does anybody know how to check a battery. I had a EOBD warning light today, and convinced the battery is the cause. I own a multimeter and am quite, electrically literate
The battery health display doesnt show green, but i would like to check it to make sure before i buy a new battery. Cant find any posts on here saying how this is done.

Any ideas?

same as any other car.
to check the battery get a battery dishcharge test done.most fast fit places do one free
check the charging system by running the multimeter over the battery engine running.should see around 12volts+
turn on a load of electrics and it should go up to 13-14+volts

Each cell is 2.1volt thus you are looking at 12.6v.

However this doesn't take surface charge into account therefore a proper load tester is more reliable(as custard stated),please take it to a dealer & get a printout of the battery status & if it needs changed use genuine Fiat battery(dealers have recently been supplied a list of updated battery numbers/rating to use)otherwise get a cheap one & watch those warning lights/messages come on

Cheers,
As soon as the missus gets home, i'll check this out. She was driving the car when this warning light came on? I just think its a cause of a woman driver, that cant drive lol. anyway, i'll post what the multimeter tells me.

So i could be right in thinking my crap battery is the cause of my warning light? (Probably was the missus crap driving tho!)

backlash forthcoming!

Which will be of little use as mentioned above.

my missus wont read this, so i'm safe from her backlash.
I'm not saying that all women are bad drivers

LOL

Reading my manual might suggest a problem with the catalytic convertor?
As the problem is intermittent, i'm thinking it may possibly be a lambda sensor?
Anybody got any info on how much are.............

1) New catalytic convertor
2) Lambda sensor (how many are there)?
3) A diagnosis on the examiner at Fiat?

Any info would be greatly aprciated!

Just interested to know if you have sorted this problem cause I am getting the same warning message. Engine flat spots around 2500-4000 and warning comes on. I throttle off and warning goes off. I hope it is something simple