Strings:
Usually I buy D'Addario XL because of all the points you get, but sometimes I go Ernie Ball. Lately 9.5-44 but think I'll go back up to 10's as they are feeling a little soft. I have whatever the opposite of acidic hands are that I can keep strings for a long time. Sometimes I try coated strings but I dunno if it's worth it. For me it's not the corrosion as much as the strings just deforming from frets and what not.
Picks:
I change my preference every few months. For a long time I was using Dunlop Tortex Flex .73 which seem to last a lot longer than the regular ones especially with the tips not wearing down. But recently got back into the Ultex Flow .73 which are a little crisper, sharper tip, and have more grip.
Batteries:
Don't use them for guitar but I like rechargeable Eneloop and Energizer for AA and AAA. Haven't used rechargeable 9V. Also have the bulk packs of cheap Amazon batteries for things that don't use a lot of power and may get lost like remotes and kids toys.
Cables:
Since I had a ton of D'Addario points, I got a bunch of the Custom series cables a few months ago. I have two longer instrument cables, four shorter ones for 4CM stuff, and a heavy duty speaker cable. They seem very rugged and don't tangle easily. I've had one of the older cheaper Planet Waves cables of theirs for 15 years and it's still going strong.