2) Charging contacts
Use a toothpick, cotton swab, or a toothbrush with rubbing alcohol and lightly
clean the charging contacts on the back of the tracker unit.
Wipe with a dry cloth or tissue before charging.
Make sure not to scrape the contacts with a wire brush or anything metal, since
this can damage the plating and cause corrosion.
3) Charging pins
Soak a toothbrush with rubbing alcohol and press against the pins carefully.
Make sure that no debris from the swab is left behind.
Carefully wipe with a dry cloth or tissue before connecting to tracker for charging.