If the ion the must be charged at 7.2 for two cels or 3.6 one cell ,usually all charges have 3 settings # for lipo 3.7v per cell #2 ion 3.2v per and #3 for life or A-123 3.3 per cell ,do not charge ion is lipo this will over charge the batteries by 0.1v and make the batteries live a lot shorter and the battery will discharge a lot faster it's not the same chemistry than lipo battery .