DC Charging?

I was looking for some advice about charging please,

I have the AC200max, I am aware I can do pass through charging during daylight.

I did speak to BLUETTI about AC charging, like going down to 20% then charging up to 80/90%

But I just wondered is it exactly the same principle when charging in DC

Takes time to build up the charge this time of year with Solar with the light capture space I have, so if I was up to say 57% and I wanted to charge a mobile phone or a torch in DC would that be ok or would that upset the battery?

Same principal applies to DC charging. No problem using the unit while it is charging by any method.

Thank you very much for your advice and feedback. I did think it would be the same principle as AC just wanted to check,
Thanks again.