every year we get the same old posts. when will everyone learn. yes Chinese and cheap lights are great in the short term. but the quality is shameful and the risk to burning down your shed or at worst house is real. led technology has flatlined which means mainstream purpose built bike lights are starting to come down in price to reasonable levels. simply go buy something that is well made, warrantied and simply works no matter the weather and more importantly doesn’t keep you awake at night worrying.
plenty of suggestions above. steer clear of eBay.
my rule of thumb and it’s just my personal opinion, if u want a self contained light and battery go with exposure. yes u pay the money but it does exactly what it says on the tin. a very good company owned and run by two brothers who are passionate about engineering and bikes.
if u don’t mind separate light unit to battery u cannot go wrong with gloworm. I’ve had an x1 and now an x2 used several times a week and faultless in proper gopping weather.
good hunting