This is a 3/8 u bolt with 2 coils on it. The u bolt is 4.5 " long and 2" apart, the top bar is a 2 and 7/8" long 1/4 " key stock. The coils are rated for 24vdc, and mesure 80 ohms each. that's all!
I will be doing a test with the time length on if it truly holds a charge for a long time. I will be doing a one day, one week one month and one year test. That will be fin! I will need a better way to check the output spike, as of now looks like the led is my best shot!