Originally posted by jlstrawman True, but only if the aftermarket battery actually delivers the stated capacity. Anecdotal evidence suggests that many of these aftermarket batteries
over-promise their capacity.
That's my experience also. My Pentax batteries (1860mAh) have more capacity than other batteries that I bought with a printed value of 2800mAh.
But the ratio of price per capacity normally is better from other vendors, even if you keep in mind, that they over-promise their capacity. So, it's a difficult decision, what to buy.