

Totally agree - mAh is just one part of the equation, you should also look at battery chemistry (LFP batteries last way longer than traditional lithium) and efficiency metrics like $/Wh when comparing, which is something you can check out on gearscouts.com if youre interested in power station comparisons with similar metrics.
If you do end up hosting on a VPS, consider one with renewable energy since tor nodes can consume a lot of power over time - or for home setups, you could run it off a portable power station to offset electricity costs (check out power station comparisons to find the best wh value for continous loads).