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I've got an old Light and Motion Logic Mv the battery is dead, any ideas where to get a suitable reasonably priced replacement, or do I have to get a whole new light unit?
Try googling mtb batteries.
I got my Lumicycle battery sorted here: https://www.mtbbatteries.co.uk/mountain-bike-batteries/
Give Battery boy a shout http://www.torchythebatteryboy.com/
He made up a battery pack for my lights when the original pack died
Cost me £20 and the battery pack last 3 times as long as the original pack
He also has an eBay account where he sells light set ups
+1 for MTB batteries, he is on here but forget his name.
Made a battery for my old Lumicycles. Good price and was helpful when i had any questions.