I noticed an improvement in battery life by quite a bit, after upgrading to ICS, but as with a lot of things battery life is subjective. Spend all day gaming and your battery life will take a massive hammering. I don't game a lot on mine but I use it like a laptop and I guess I get a decent day out of it with full brightness and a fair bit of YouTube
There's so,e tweaks to the build.prop on ICS that add some helpings to the battery life, also if you're rooted you can use setCPU etc to lower the screen off CPU freq thus saving battery there
Sent from my A500 using xda premium
Current Phone: HTC One X/Tegra 3/Black/IceColdJelly AOKP 0.7
Current Tab: The Venerable HP Touchpad/OaTs Latests/
Laid To Rest: Nexus S/HTC Desire/Archos A101/Acer A100

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