The night-vision goggles had a piezoelectric battery. From the transcript of the episode:

Given the titles of the last 4 episodes & what Nolan & Plageman mentioned about their approach on AI, spent the better part of the last 2 months trying to think of the most outrageous things I possibly could on what might occur over the last leg of the season, and set the stage for next year forward (Singularity, AI…

Root's not gonna die. WILL NOT HAVE THAT.

Just like Bruce Wayne did to Robin John Blake. (cue the Zimmer drums)

FIVE SMILIES. This ain't going anywhere…

Fuck 'em. Trust the Cancellation Bear. He knows where it's at.

Thanks. Both shows are heightened realities of the world anyway :)

But he ended up killing Lambert in the simulation itself with that grenade.

If you've seen 24, Jack Bauer's done it with both arms tied behind his back, and once while being suspended in chains with his hands cuffed above his head.

Probably too lonely after constantly hearing the old codger ramble on & on about how SAM's to be valued over anything else. Knew her days were numbered, and wanted to spend it with someone who she can relate to.

'Last Call is one of many frustratingly dangling threads the show has accumulated over the years.'

Yeah, Root's hacker buddies are working on his cybernetic resurrection.

Here's a little preview. Found it last week.

Just remember him being listed as guest in the pilot. So he got promoted to regular over the course of the season. That changes things a lot.

Isn't he recurring there too? As long as that's the case, his involvement in here won't be affected.

Just one, unfortunately. If it were an odd-numbered season, they'd have probably gotten an additional episode to pace things out.

Least now she can hook up with Greer's first dragon, Kara Stanton, in the afterlife.

Yeah, Gotham got renewed quite a few months ago.

Despite being their biggest shipper, was Martine jealous of Root for her bond with Shaw? Maybe cause it took her more than a couple of months and a shitload of equipment to break & mould her into her new BFF… while all Root needed was less than 5 minutes and a clothing iron.

I'm guessing there'd be some resolution on that. Though Gabriel & the President's Chief of Staff Mike Richelli (Michael Gaston) aren't listed in the press release, they could still be present.