Elf,
I you you are plugged into shore power or using a generator, the answer should be no, and your lights should work as well as all other DC circuits. By 2009 as your camper appears to be, all power supplies (converters) were internally filtered and did not require a battery to deliver adequate DC voltage to the distribution panel and DC circuits. If your battery is not receiving charge, either the converter is shot, there is a fuse or short stop (or other brand DC circuit breaker) tripped preventing the DC from reaching your batteries. Many people that keep their RV permanently stationed in one place just remove the battery and it makes since IF you don't have the old style linear type that required a battery for filtering.