Honestly it’s just market inefficiencies at this point. I build battery packs for drones and RC planes and the lead acid stuff is just garbage. They can’t perform to more than 60% of their rated capacity and then start voltage sagging. The energy density is pitiful. A small UPS under your desk with LiFePo4 cells would outperform the lead acid 3-4x for the same space and last longer for the same or less money.