Phd nutrition battery is a fast acting carbohydrate drink it has been formulated to give you the energy you need to hit a high standard of trainingr phd battery contains a blend of three key carbohydrate sources these are designed to work differently the three different carbohydrates are fructose dextrose and maltodextrinr fructose is a sugar it helps with energy levels and has a fast absorption rate giving you that quick burst of energy that you need while at the gymr dextrose is a fast