The Lezyne LED CR2032 Spare Battery 2 Pack for Lezyne Femto Drive LED. A good value pack.Lezyne LED CR2032 Spare Battery 2 Pack FeaturesEach Lezyne Femto requires two batteries.Type: CR2032, non-rechargeable.Note these batteries fit, and are good for, many other cycling devices like types of heart rate monitors and cycle computers.
Best Price: £4.00 from Leisure Lakes Bikes