Actually the smart actions battery saver does almost the exact same thing as jd ultimate. I've used both and I prefer the smart actions because it turns your data back on alot faster. Atleast it does on my phone.
The best battery saver app i have seen is actually built in. If you hold the sleep/power button for approximately 2 seconds and then press option 4, you can get insane battery life, if you choose option 3, it will give you great battery life but not as good as option 4.
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