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I just plugged it back into one of these https://www.screwfix.com/p/4lite-indoor-outdoor-maintained-or-non-maintained-emergency-rectangular-led-bulkhead-white-3-5w-167lm/135gg#product_additional_details_container as they contain the battery, charger and a strip of cobs, they run as is for about 2hrs, but with the strips I found at work more of a glow than a bright light they last a lot longer.
How do these recharge? Looks like they might be worth exploring