Battery issues with 2009 Honda Jazz - going dead too quickly

[TwinJazz862]

Hi all!

I can't remember if I've asked this here or not but I'll ask anyway.
My 2009 Honda Jazz (GE6 1.4 L L13Z1 manual if that helps) has been have battery issues over the last year or so. The battery was replaced and that seemed to fix it for a while but then it started acting up again. Brand new battery put into it, no improvement. The alternator was changed, it's just gone dead after sitting for three days. I drive it five days a week in and out of work, I don't leave lights on in it and it was locked for the three days. Does anyone have any previous experience of a similar issue? I've looked it up online elsewhere and on YouTube but nothing seems to be working.
Any help would be massively appreciated!

[Synchrotron]

The battery on the mk2 is quite small. If you have a power drain anywhere, it might be draining the battery faster than you can recharge it while driving, especially if your commute isn't very long.

Do you have a multimeter?If so, you could try and test for this, e.g.: