Cheaper? I think the 9800 and 9810 batteries are identical.
Agreed, they are both the FS1 battery.
She maybe right though, just look at cases. If they say they are for the 9810 they are more expensive even though both phones are identical outside. I've noticed that trend with quite a few accessories, not sure if its intentional or not, but I definitely watch when I buy and usually end up getting something for the 9800 as listed instead of the same exact thing that's listed for the 9810 at a higher price.
