Add 1/2 bars for better service reading. Shows more precise readings instead of showing two bars when you actually have 2.5 bars.
Bars is a cool Cydia Tweak which will give you more accurate service bars. Normally you only have 5 service bars at the top left in the status bar. What Bars does is adds half service bars in between your standard service bars. Bars can be found in the Cydia Store for FREE under the BigBoss Repo