Are Electrolyzers worth it?

Oooh - now that's useful to know! Thank you.
So, one could theoretically charge cells in one storage unit, and then "redeem" them in something of a higher tier for less loss... or use them to keep alower-tier unit charged in the field. I like.

Many thanks, I'm tempted now to use batboxes instead of copper cable for non junctions and with some advanced pipes and redstone engines to stockpile charged cells.