Is there a way to increase a voltage without loosing amperage?
Increase Wattage. The main reason to increase voltage is to reduce amp draw so what you are asking for may be counterproductive at best. However, since you are asking this in a battery topic, I am going to assume that your goal is to push more volts while not sacrificing amp-hours (endurance). The answer to that is simple; more cells. For instance, most laptops require the voltage of 3 LiON cells. For added endurance, some use 6 or 9 cell packs wired series-parallel in either a 3+3 or a 3+3+3 configuration.