Yes, that is the "internal" D cell replacement for the AA cell pack. I installed those on all my cameras at setup. You can also get the #3358 6-cell external, or the dual power bank external, to extend your run time longer.
With just the #3495 on my J cameras I was getting 32-90+ days on a camera, depending upon whether it was being used as a repeater. I did not have 3358s on my J cameras this year as at the time I deployed them the cable to connect the J cameras to the 3358 had not yet been released. I did, however, have a 3358 on my cell transmitter. IIRC the system went up in early/mid June and I pulled the cameras on Jan 1. The transmitter had been on internals for some time, but made it that entire duration without touching it. I'm eager to put dual power banks on my cameras next year and run the whole season.