[tsaksa]

Ditto on trying another battery, or at least checking the voltage while it is under load.

But you may want to also try pulling all of the breakers, and disconnecting the 5V and 24V power connections, such as connections to the CRIO. It is possible that you have something pulling more current than it should in standby mode and that may be helping to drain your battery faster than you suspect.

If you get a reading of about 12 volts on the battery and the lights do not come on with the CRIO and similar devices disconnected than you probably have a problem with the power distribution board. If the voltage is well below 12 volts than at least part of your problem is the battery. And, if you unplug the CRIO and the light suddenly comes on you need to check your wiring to the CRIO or the CRIO itself.