Wuz shopping at Home Depot after church today. Ran across these two kinds of battery-powered Christmas lights. One is pretty standard issue: multi-colored lights, LED, 3 AA batteries, on/off switch. See first pic. Originally $6, but marked down and also on 50% discount. Cost $1.50. I got the last one.
But the second kind really caught my eye: tiny red inline LED lights, 3 AA batteries (but believe AAAs would fit), with on/off/flash/phasing switch, that automatically goes off after 6 hours. Cost $2.10 for a two-pack. Also comes in blue, yellow, and some other color. I bought two 2-packs. Weight with AA batteries, just over 4 oz. Definitely intend to try these out on my ridgeline.