

To elaborate on the price, those pods have ~11g of coffee in them (according to the first link I clicked on). For a (north american) standard size cup of coffee (350 ml), I use about double that. You can either chose to have a much smaller coffee, or a regular size coffee that tastes bad.
For the same price per gram of grocery store brand pods, you can get really good freshly roasted, single origin, free trade, etc. beans.
My kitchen scale that runs off of one of those batteries lasts for years, and I use it every day (coffee). Yours must have some kind of parasitic draw.