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As the world leader in the experimental aircraft market for lithium batteries, EarthX has used all that experience and knowledge to become the first ever TSO’d approved lithium battery manufacturer with a 12 volt battery and now we also have a 24V TSO’s approved battery. Having a government approved FAA certified battery is only half of the process. In order to install this, you must have a field approval (part 337) or an STC (Supplemental Type Certificate). EarthX has been working diligently with the FAA to get STC’s for you.