I've been using a Hornady beam scale since around 1980. Last year I decided to get a check weight set just to see. It was still reading right on. So I see no need for a battery powered device when the balance scale works so well down through the years. Plus I'd always be 're-checking' the electronic scale to make sure it was reading properly.
Had an RCBS ("Pal" or "Partner", don't remember the name for sure), that ran though batteries, had to have a pretty fresh one to work, when changing batteries had to fool with "recalibration" procedure (sometimes more than once to get it working). Went back to my RCBS balance beam when the electronic one failed after about seven years of so...will not go back to electronic...I do not see a pressing need for anything but a mechanical balance beam scale.