But it isn't as simple as 'GB is better in terms of battery than ICS'.
Some people on here (who help a lot of people in Q&A and whose opinions I really respect a lot) say GB is better, ICS is buggy & they've had crap battery life from the roms they've tried. For me, I get the best battery life I've ever had with CM9. Why ? Because I've put in the time/effort to tweak my setup to make it that way. My point is if you ask 100 people on XDA that question, you'll get different answers to the question depending on the person.
So far as rooting/not rooting concerned, again, nothing to do with battery life per se. What rooting does is give you control over your phone
, and can
(it can also enable you to make your battery life/phone performance a whole lot worse) enable you to run kernels (and tweak those kernels), and enable you to set your phone up to possibly give you better battery life .
Given it's your GF's phone & I presume you want it to work well 100% of the time with no glitches (because you'll probably end up playing tech support, which from experience I know is a pain in the arse), leave it on stock.
On the other hand if you like a challenge, I've given you plenty to think about in my two posts. Every bit of info you could possibly need to tweak your phone is on XDA. It's just a matter of searching, reading, learning & then using that info to make a setup that gives you what you want.
Originally Posted by Nebtawi
No no you guys understood my q wrong. I'm asking if GB is better in terms of battery than ICS and not rooting the phone is a better option than rooting or not. I'm not asking any roms or kernels since I don't need any recommendation on that for myself since I've been trying diffrent roms and kernels in that matter. I just want technical information for the stuff as I mentioned above not rom or kernel. The difference between GB and ICS, stock phone and rooted phone. Does rooting a good thing or not ofc I've read tweak battery life related posts before asking mine but couldn't find any info comparing my needs.