This is a good "starter" to get into Lithium Iron Oxide (LiFePO4) batteries. It's got a 8AH capacity,
and built-in balance/protection board so it's fairly trouble-free. The first time you pick it up will be
a jarring experience, as you'll just be expecting it to weight around as much as (or more than) a regular
7AH sealed lead-acid battery. But it's only about 1/3 the weight.
Be sure to get a proper charger for it, you can't just use a regular lead-acid charger.
I got one originally in 2021 (for $36) to use to run my bicycle light, but I've since replaced it with an
18650 light, so this one has mostly been used to run the talk-in radio at Field Day events.
They recently dropped the price to $14 and I got two more on a whim when I saw that, but the batteries I got
were problematic. Both had deeply discharged. (in storage? new old stock?) I was able to "wake" one of them
but the other one looks to be bricked.
The batteries look identical, although the 2021 claimed 2,000 cycles and the 2026 ones claim 3,000 cycles.
There's no telling if the 2026's have different cells or are just fudging their numbers.
