Battery monitor on a automotive relay form factor

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Jesus Echavarria made this battery monitor and wrote a post on his blog detailing its assembly:

Here’s one of the design I do last year for a client. He wants to measure the voltage of a car battery and set a couple of alarms when voltage falls below a defined values. Also, he wants to put the device in the relay box of the car, so the design needs to have a relay form factor to easy integration. So, after a couple of iterations, here’s the final design of the battery monitor.

Via Designing Electronics in Spain.