with the limited info you've provided so far, we can only assume that you are dry camping and have no electric hookups nor generator.
with only a single battery, you'll have no battery power very quickly, unless you are an experienced dry camper and know how to conserve power.
most dry campers, which i'm one of, have at least 2 deep cycle batteries and a generator. some also may use solar power.
sitting at home, not hooked to shore power, the trailer's parasitic power drains will empty a battery in just a few days, without you even using anything.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC