NO crank NO power

Your saying the starter motor won't crank the engine, no electrical accessories work? I'd use a digital multimeter across battery posts, everything off. dc setting, One meter lead to positive post, the other one to negative post. The generic spec for a full charge is 12.6 volts. If reading much below that, use a charger and get it charged up. Make sure battery cables and connections all good, no voltage drops. Check voltage at fuses in fuse boxes, you can use a test light for that, interior fuse box and under the hood fuse box. Some fuses are hot all the time some go hot with key on, check them both ways. If nothing, I'd have to check voltage and ground feeds, for the battery. Check applicable trouble codes, po as well as manufacturer specific codes. good luck