@woozle checking myself against the Wikipedia article I see they go into more detail, including the idea that it's a trade off between depth-of-discharge and battery life.
For a fixed-site (ie, not mobile) installation size is going to matter less so can better accomodate the need to limit the depth of discharge to 50%. Heavy-but-cheap is just not so much a problem for that application.
Also interesting to see the stuff about recycling:
This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!