You got 2 unrelated things in your question…
VoodooBattery is an alternate way to get battery info for hackintoshes. NBI doesn't use it and never has and I'm pretty sure it won't use it in the future. I'm pretty sure that there are dstl patches for the Dell battery that get applied which is a better method. Meklort (the person who makes NBI) can answer the how it works exactly question better than I.
VoodooPowerMini enables speedstep (for both 10.5 and 10.6) and currently isn't in NBI. I don't know if Meklort would put it in NBI or if he even can, as in is allowed to. SpeedStep not only helps with battery life but will keep your mini cooler.
Mini1: Vostro A90, Black, 2G, 1.3 Webcam, Bluetooth, 64G SuperTalent, OS X 10.6.4
Mini2: Mini9, Black, 2G, 0.3 Webcam, Bluetooth, 32G RunCore, OS X/Win 7, internal PCI-e SHDC Reader
Mini3: Mini10v. Black, 2G, Webcam, 640G HD, OS X 10.5.8/Win 7/Ubuntu [Hibernate w/NBI 0.8.3 RC4] Dropbox Referral