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also check the forward voltage on the uv leds... i did this once with uv 0603 and they only ever worked on AA batteries..not plug and play batteriesnot recharable AA'sjust standard AA'sthis is because the forward volage was 3.2v-3.8v so the 2.6v from the plug and play battery.or the 2.4v from the recharable AA's werent enough Vbut the 3v you get from 2xAA (1.5v) batteries is just enough to light the led's...also they will work if the pad is plugged in with plug and play but turn off as soon as its off of charge
This is your fix, fresh AA batteries are a must for UV LED controllers.