Different types of batteries and their differences?

when it comes to batteries there no real difference. AAA, AA, C and D batteries all have the same voltage, they just have different wattage. so, the smaller the battery, the less watts it has, and the less energy output.

There is also differences in batteries based on the technology of the battery ie. NiMH, Alkaline, etc...and there are also differences, while slight, between brands.