It should work fine. It will just charge at 3A instead of the 3.2A max that you could charge it at. According to the manual, it uses the standard CC/CV charge method for LiPo packs, and has a 3 hour safety timer. There is no mention of it actually limiting the total charge (mAh) it puts into a pack. You should easily be able to fully charge a 3200mAh pack in less than 3hrs with a 3A charge rate.