FWIW -
BatteryBoss Calls Out False Capacity Claims!
That's the site he may be referring too. Seido has been fairly well documented by battery enthusiasts for overstating their mAh.
Both Seido batteries produce less than 84% of their advertised mAh. Which means that a 1750 mAh battery will presumably only produce 1470 mAh.
Not a whole lotta gain over the stock 1300mAh OEM Battery.
Just sayin...
For me, i'll wait to see how the 2150 looks with the new back and if conventional cases will fit.