battery life for cbr vs. vbr?

[loki102]

i've been wondering, do vbr mp3's use more battery than cbr because it takes more processing power to constantly change the bit rate versus the constant bit rate with cbr?

[stasyna]

I really doubt this.
VBR is far superior in quality, and the iPod shouldnt have a "hard time" playing them. After all, I get 9 hours of battery on my 8 month old 2nd Gen iPod. All i use is VBR - on occasion the 192 CBR rip will pop into the iPod.