After using my 80GB Zune, I noticed that the battery life was reduced a bit.  This was troubling because I really wanted a high capacity long lasting devices.  That is when I found that http://www.rapidrepair.com/ had a Zune eXtended Life Battery (http://www.rapidrepair.com/shop/3003-microsoft-zune-extended-battery.html).  I bought it, installed it and it did the trick.  I would suggest this upgrade to anyone who needs more battery life or has upgraded their Zune and have now found that the battery doesn’t last as long as it used to.

If not done properly, modifying your Zune can ruin it.  Opening your Zune device voids your warranty and is not recommended by Microsoft.

Here is what my Zune looks like now: