Slow crank on my Jazz

[coldclimate]

Hey gang,
In the last month my 2011 Jazz has started being very slow to crank every so often. Battery seems fine (I stuck it on the charger/conditioner over the weekend). It doesn't do it if it's been out and about, only first thing i the day. Here's a video of it being a prick this morning https://photos.app.goo.gl/QTMjg2Nb8j8RCoHdA

The only thing that's changed recently is the rear parking sensors were replaced after somebody rearended it (and drove off!)

[liner33]

Make sure battery connections are tight and check the condition of the earthing straps

[steveo3002]

very much looks like a flat battery...have you done anything to confirm its charged? might just have died

[coldclimate]

Minor update - looks like it might have been fuel!
It was taking longer and longer to turn over though the week, but I was down to a quarter of a tank, so I filled it with something premium. The next couple of days it took less and less time to catch and this morning it went first time, despite having stood over night.

[steveo3002]

should crank the same with a tank full of water or treacle ....wasnt that

[coldclimate]

Knackered battery, wouldn't hold a charge, replaced, all sorted. Frustrating, because it's only 9 months old.

[liner33]

Should be warranted then

[bearman68]

How did the new fuel knacker the battery? Confused....