No reason an '06 battery can not still be good.
If you have not already done so do what I do when my '06 battery goes dead.
CLEAN THE TERMINALS
Because so far every time it's gone dead, and I crawled under this rig with the battery tester and the wrenches.. Unhooked the Negative cable and clamped on the tester.. The battery has passed with flying color (GREEN). And cleaning and re-attaching started the horse up.
Of course.. IF the battery really is dead.. Well, you gotta do all but the test anyway so you really are not out extra labor.
I use a Chicago Tools battery tester, up to 500 amp, adjustable, it has two meters and a knob, Got it at Harbor Freight.. One heck of a tester. Wear gloves when using it, Gets hot if you do more than one test. (Gets NOT!! if you test HOUSE batteries) Even if you only pass power for 15 seconds. 450 amps (The most mine will draw) at 12.5 volts is over 4600 watts.. That's a whole bunch of heat.