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I'm quite of a beginner with electronics.

I’m building a robot powered by 4x 24V car batteries connected in parallel. I need a power switch circuit that:

Powers on the system when a momentary push button is held for 3 seconds. Keeps the system powered until the button is held again for 3 seconds to turn it off. The requirements are:

The system voltage is 24V, and the batteries are capable of delivering high currents. The circuit should prevent accidental activation or deactivation with brief button presses.

Currently, I just have a main switch with a relay to hold the power on. Any suggestions what I should do? Tutorials etc..

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A 3v3 schmitt trigger sharpens the edges to Clk input of 4013 D-flip-flop.
Bat54 (or BAT46) schottky diode quickly discharges the capacitor after PB becomes released to be ready for next press.

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