Hi there,
Yes, that is correct. Accumulators are adjusted in this way because people have carefully designed blueprints to achieve as close to perfect a ratio as they can - and without this, it would make all those blueprints useless.
If you use accumulators as only batteries (say, to handle surges from laser turrets going active), and not with solar, it's a bit OP. Personal armor batteries are not adjusted because they don't have a cyclic ratio like their on-the-ground counterparts.
With that said, this is a feature I could add if there's desire for it. But it comes with the same kind of caveat. With fusion reactors, it'd be a bit OP.