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extend battery life

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Reminder tip: Disable Wi-Fi during sleep to dramatically increase idle battery life on tablets and devices you don't often use

Many of us have a tablet or an extra phone (or more) that we keep lying around the house or office for media use, for reading or browsing, for testing, or maybe even as remote controls for smart home appliances. Thing is, 8 times out of 10, when you pick up this tablet or phone to use it, you discover the battery is completely drained because you forgot to put it on the charger and you haven't used it in a while so you didn't notice the low battery level.

The issue is multi-fold and hard to diagnose: sometimes there's a sleep bug in the processor, sometimes your Wi-Fi network is jammed and exacerbates the battery drain, and sometimes you have so many things syncing in the background that the device is constantly working and never really idle.

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Rooted HTC EVO 4G Users: Use SetCPU To Extend Battery Life

For many people, the EVO is an excellent phone, but extremely weak battery life is a huge detractor. Now, however, always-helpful user Pingpongboss has posted some instructions over at XDA-Devs for how to use the SetCPU app to significantly increase battery life. How significantly? He estimates that he could get 64 hrs with the screen off on a full charge. Pretty impressive stuff. Before and After graphs:

before CAP201007081156

The key is disabling Perflock – a bit of code by HTC that keeps the CPU running at a set speed, regardless of usage. By disabling this and setting custom profiles, the CPU can underclock when its use is lower.

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