I would not find the self-weighing handle of much value--one scale that goes in a carry-on is less to carry than building a scale into each suitcase. (I rarely travel alone, one scale suffices for however many are traveling together. I can see more value for the business traveler.)
I also see no point in a battery. If I want a battery I pack a battery--and it's in my personal item, not my rollaboard. If you're determined I would suggest instead omitting the battery but making a USB pass-through connection. Instead of the usual plug straight in I would make the plug go parallel to the case (put it next to something that's going to stick out anyway so it doesn't make it any bigger, or if there are no such locations, put it in a recess) so the wire isn't as vulnerable and you can use whatever battery you want.