I'm getting at least 20 miles from my 52V, 6 a-h, Luna mini battery with BBS02 mid-drive. Battery is reported to weigh a little over three pounds, but I haven't weighed it yet. The 52V, 10 a-h one my wife has on her BBS02 is still going strong after more than two years and does double duty in a 48V, 1000w rear hub system (33+mph).