The specific wording from FAR 25.001 is:

   (b) It applies to supplies acquired for use in the United States, including supplies acquired under contracts set aside for small business concerns, if-

           (1) The supply contract exceeds the micro-purchase threshold;

If the micro-purchase exception applied to only the foreign portion of the total value of all supplies under one contract, (b)(1) would be worded: "The non-domestic portion of the supply contract exceeds the micro-purchase threshold." Unfortunately, it doesn't.

If the batteries could be purchased using a purchase order or with the GPC, it would then be within the MPT.