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Battery Arduino Pro Mini . After making each of his three modifications, klements was able to reduce the current consumption of his arduino pro mini from 4.5ma to 7ua, 640 times less! I recommended that you try to find a genuine tp4056 charger,. Arduino Real Time Clock Tutorial (DS1302, DS1307, DS3231) NerdyTechy from nerdytechy.com This arduino pro mini uses over 600 times less power than a traditional pro mini, using a couple of simple changes which cost around $2 to make. The power pins are as follows: The regulated 3.3 or 5 volt supply.