Multiply a battery’s voltage by its amp-hours and you get watt-hours — the only capacity figure that compares cleanly across brands. Divide that by the price and the 22 bikes on this site sort themselves into two groups with almost no overlap.
AMYET’s V9-G60 holds 960Wh for $689, about 72 cents a watt-hour. VTUVIA’s SF20H holds 672Wh for $1,399, about $2.08. EUNORAU’s SPECTER-S holds 840Wh for $2,999, about $3.57. Nobody buying the SPECTER-S is being overcharged for battery: they are paying for a Bafang mid-drive, eleven gears, published suspension travel and a frame that comes in two sizes.
That is the whole argument of this site, and it is why we compare on what each brand is willing to write down rather than on headline wattage.