Relock iPhone 2G

[hanguolaohu]

My unlocked iPhone 2G recently drains its battery very quickly and I have to charge in the middle of the day. The OS also operates very slowly. I'm wondering whether it's because the battery is old or because the unlock software should be upgraded. I want to take my iPhone to Apple Genius Bar, but I'm guessing I need to relock it so it's covered under warranty. Can I accomplish this easily using Pwnage? If not, what is a good method.

My specs:
iPhone 2G
Pwnage v3.0

Thanks.

[i.Annie]

Pwnagetool is for jailbreaking and unlock on 2G, not for relocking. All you do is restore your phone and it will be relocked and unjailbroken.