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I have been looking for a 18650 power supply for my UBITX and finding a supply of 18650 from various battery packs with bad wires, management boards etc. I did not want to mess with the spot welding on used batteries. I found this at Parts Express. everything I want? DC in 5-24 VDC in for charging, a solar input up to 19v a relative battery charge indicator, and other outputs. Also replaceable battery holders.? ?The only thing I need to figure out is it needs a temporary charge volt to start the circuit. Small problem. Take a look at it. 73 KG4VHV john

part # 325-201