Electric scooters from start-ups like Bird and Lime are popping up around cities like Los Angeles and Washington, D.C. Bird relies on contractors to charge scooters overnight at between $3 and $5 per scooter. Here's how to make money charging electric scooters.

Harry Campbell, founder of The Rideshare Guy podcast and blog, took CNBC reporter Kathleen Elkins on a "Bird hunting" trip in Santa Monica. The sign-up process is simple if you live in a city that has Bird scooters with chargers using the same app they would use as customers.

Once approved, Bird sends charging supplies for three scooters. Bird provides additional chargers to those who establish themselves as reliable and consistent. In some cities where Bird has too many charging contractors there might be a wait to join the program.

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How To Make Money Charging Bird Scooters