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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,197
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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A lithium ion battery is usually between 3.7 and 4.1 volts DC. I have used such batteries to test my dyno powered taillights. I have no idea if the voltage and amperage is strong enough to test a headlight, but it might be. Just a thought if you have such a battery for a phone or camera, you might be able to test your light system.
Some camera batteries have twice that voltage, since I have no experience at trying a DC source of such voltage on any dyno powered lights, I would not recommend that.