well, yes. but there are higher capacity batteries available. they didnt have to use 950mAh 3.7v batteries, did they? the iphone uses a 1400mAh 3.7v battery.
that battery is physically larger.
battery capacity is pretty much determined by volume with mobile phones. assuming they use the same technology.
you might cram a little more in by improving the quality a bit, but it won't make a huge difference.