Battery discharge consistently greater than usage?

I’ve been starting to look into our base load, see what’s drawing power overnight (fridges and PCs mainly I think), but I’ve noticed that my battery is discharging a fair amount more than I’m consuming, often >33% (even after accounting for minor export fluctuations adding to the battery load)
Now, I realise this screenshot is a bit insignificant in the scheme of things - ie showing 10w/hour difference - but this behaviour is seen through the day too, just messier to show due to solar/import/export all being higher and more variable.
Is this effectively battery losses that I’m seeing?
Thanks for any thoughts

Garuff Conversion losses from DC-AC when discharging, vice-versa when charging. Full rate charge/discharge has losses of around 15-20% round trip.

Edit - chemical-based losses in the actual battery cells are around 3-5%.

Garuff see what’s drawing power overnight (fridges and PCs mainly I think),

Don't forget the inverter itself, as well as the battery. They will be consuming power from the battery, but those won't show up in the load charts.

You're just seeing system losses. None of the system is zero sum sadly.
I don't actually know the efficiency curve of these but they do seem to struggle more at lower loads but I've no data to back that up. An experiment for some point I guess.
You can (crudely) work out losses by subtracting various inputs & outputs to work out the difference (equally the app itself has a setting where you can turn this calculation on & off to "massage" the figures so they all add up nicely or not).
I did a similar thing in HA with a custom sensor (although more to fill a gap than anything else):