Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,177
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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Is your light powered by an internal Li Ion battery? I am not familiar with your specific light, but some Li Ion batteries have a protection circuit that prevents them from charging if they were discharged to too low a voltage, I am not a battery expert but it is my understanding that this protection circuit is for safety purposes. When I have had a Li Ion battery refuse to take a charge, I chuck it.
I buy AAA powered taillights, if the batteries die I can replace them easy enough. And I use NiMH rechargeable AA and AAA batteries, have not bought non-rechargable AA or AAA for over a decade.