If I was in the market for a battery top handle, I'd have a long look at the Echo 2500t. I dunno what the power is like, but the advertised weight is pretty attractive...I think only 7-ish lbs with a battery, that's still lighter than most of the gas top handles. I think the battery powered Husky top handle is advertised at 6lbs, but that's w/o battery...I think ready to cut, they're around 11, but I could be wrong.
Thanks. I'll have to go looking to find an Echo dealer....or order one on-line. My local dealer closed down several years ago.