As others have mentioned already: we need context, else this is near impossible to answer, because the (half) sentence: "Ich bin Laden" makes no sense.

First of all: is it "laden" or "Laden"? (lower case "l" or upper case "L"?)

The first means "to load" (a truck, etc) or "to charge" (a mobile phone, etc) - the latter means "store/shop".

So, a meaningful German sentence would be: "Ich bin dann mal am laden" - if the person saying it, is someone who is going to load stuff on a truck (or in a trunk, etc) and who wants other people to know about it
or
if the person saying it, is someone who is talking on the mobile phone and is telling their dialogue partner, that he needs to end the call, because he needs to charge his phone now (because the battery is close to shutdown).

"Ich bin im Laden" (could also be: "Ich bin am Laden" (mind the capital "L" in both cases) = (I am in the shop / I am at the store) would be another meaningful sentence...but only with the "im" (in) or "am" (at) - not without it.

Logically, you can't be (a) store - which "Ich bin (ein) Laden" would mean.