I’ve never used these but I did pick them up in the store one day. I’ve heard great things about the brand and no cord is certainly tempting. But just in that quick feel I wasn’t in love. While the whole unit was light enough it felt like the battery itself was a bit heavy and would throw the clipper off balance. I dunno, I base that only on a real quick feel… I certainly wasn’t willing to pay the price to test the theory.
FWIW I’m also a KM10 user and love them for their power and longevity in the “small” clipper class. They can be a little loud for “small” but will still be quieter than your Listers. The small Andis clippers would also likely suit you… very, very light and quiet. I just find they tend to crap out if you do too many body clips with them, but as long as your couple aren’t total yaks, you’d be fine.