Nano Potions restore a Nano's energy. To use a Nano potion, you must have the Nano out and press "C". The amount used depends on how much stamina the Nano has lost. They can be purchased from shopkeepers, or obtained from monsters.
From shopkeepers, amount bought is 1x100. So currently, the maximum amount of potions that could be owned is 9999(10,000) potions. So if shopkeepers do have 1x100 potions, each 100 costing 100 taros, so to get maximum amount of potions ( which is 10000 potions) the player must pay :