15R SE battery

Are there any batteries with a longer battery life than the current 48WHR battery provided with the laptop.

Why hasn't Dell released a 9 Cell?

Are they going to?

Battery Part Number: MHPKF (60WHR)  is a latitude battery which appears to have the same dimensions and connection as Part number 8P3YX (The supplied 48WHR Battery), is it compatible? If not can a future BIOS update provide compatibility.

48WHR is not enough, I am disappointed Dell does not provide more options for its customPosters, something that it is typically very good at.

This is a problem which is highlighted on many reviews of the Dell 15R SE/17R SE and even customer reviews of battery 8P3YX on Dell's own page.