For an answer as to why not to use batterypatch or speedpatch, just do a power-search from the column on the right for either. You will find one announce thread, and about 500 "problem" threads where people installed one or both of these and it screwed things up.

These "patches" make permanent changes to your device, with no way to undo them except a re-flash. An uninstall does not undo the changes! These changes can lead to anything from reboot-loops to the device just being flakey, including problems with camera use, calls, TV-out, USB use, and just about everything else.

There was one thread where several people (over 6) were complaining about how their device is slow and can't do even basic camera recordings. When asked what they had installed, each listed different things. The only common item for all of them was "speedpatch". (One later found a conflict between speedpatch and MaxCPU, but no other users had MaxCPU installed, and many people that have MaxCPU installed have no issues with it. So I still blame speedpatch.)

If that doesn't convince you that you shouldn't install these magic patches, where the author himself says he doesn't fully understand how or why they work, then I don't know what more I can say to convince you. These patches mess things up in ways that make trouble-shooting issues next to impossible, for little or no gain.

Sorry to be blunt, but at this point if someone says they have speedpatch or batterypatch installed (or has ever had it installed) I tell them to reflash their device and not install either patch again. I also won't help troubleshoot any of their issues again until they do so, since to do so is an effort in futility. Several other people here that are good at solving tech issues and offering that help freely (many of whom will thank this post), have started doing the same.

If you do install them, you better be good at fixing your device. Because you're not getting help for most people in this forum once you install them.

Again, this is all just our (my) advice. It's your device... install what you want. But if you install stuff that most people here are convinced is snake-oil, or that the author himself can't explain how/why it works, don't expect people to rush to your aid when things break.