I used these 4.2 volt converters to power two of my old under counter LED blocks. These devices turned LEDs on and off when motion was detected. The LEDs were powered by 4.5 volts from six AA batteries connected in parallel. These batteries had to be changed too often because the system drained them very quickly. The converters fit perfectly in the housing of the LEDs and the blocks work like new. The converters do not get hot and work as expected. All for the price of one set of AA batteries!
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