extended battery....wiping battery stats?

[bcrtj457]

i used to have an Evo. I rooted it. when i got the extended battery, i had to wipe the battery stats.
i posted a thread about it, but no one responded.

My epic is not rooted, and im wondering if i need to wipe my battery stats. and im also wondering how do i wipe my stats if im not rooted?
will a factory reset wipe the battery stats?

Thanks in advance.