[Samsung Galaxy Nexus] Tubes6al4v:
Table of Contents:

1. Quick Tips

2. Monitoring Battery Usage

3.The Nitty-Gritty Details

4.Frequently Asked Questions

5.References

6.Changelog

The Nitty Gritty

The key here is to think back to physics class. We have an energy storage device, and a few devices that consume energy and varying rates (power - NRG/Time)

Kernel Stuff

Adjusting Clock Speed

- CPU and GPU frequenxcies will directly effect energy consumption when in use. That is to say, if your phone is just idling with the screen on, the CPU is using very little power. Much more is being eaten by the screen. There are two approaches to saving power in clock speed, both of which aim to reduce the time spent at higher frequencies.:

Reducing maximum clock speed.

Using cpu governer that keep the CPU at lower frequencies for longer periods of time. Power save, conservative, smartass, etc take different theories as how to achieve the best ballance between performance and energy efficiency.

[TIP] Use CPU spy to check much time the CPU spends in each frequency, and more importantly in deep sleep.

Adjustiing CPU Voltages

- Using a kernel with an unlocked voltage table and setcpu to specify voltages for each individual frequency can lead to significant power savings from the CPU. When experimenting with voltages, do not check “set at boot” until you have established stable voltages.

Suggested Voltage testing: Coming soon...

Antennas

Wifi

Consumes more energy per time when trasmitting than mobile data, BUT...

Takes less time to transmit data, espescially large files, so it consumes overall less energy.

Wifi scans for a connection and pings the router less often than mobile data, thus consuming less energy at idle

Bluetooth

Consumes a small amount of power at idle to connect to new devices

Scanning for deveices consumes more energy

While connected, very little energy is consumed unless data is transmitted.

GPS

Unless an application specifically invokes the GPS antenna, it will not consume power

Using constant GPS updates (as in Navigation apps) will consume a large amount of power

Some apps will have bugs in them which will keep GPS on indefinitely. Try reinstalling those applications first, then remove if necessary.

Mobile Data

2G antennas consume the LEAST amount of energy at idle, but because they take so long to trasmit data, they can kill your battery.

3G antennas are Ok at idle, but take less time to transmit data, so are the best all around for traveling around metropilitan areas.

4G Antennas are FAST, but consume the most power. Best to leave these off when in transit, and used for stationary, stable connections

All Antennas consume much more power idling in areas of bad reception. So if you know you're going somewhere with poor reception, and don't need data, turn it off until needed (Settings->Wireless&Networks ->More ->Mobile Networks-> "Data Enabled"; "Data Roming" OFF; "Use Only 2G Networks"

Radios

Radios control how your phone connects to the mobile network. Specifically which proticols to use in which regions as well as how often to try to reconnect. This can lead to better or worse battery, signal, and network speeds.

NOTE: The Baseband is defined by 3 sets of codes. The first two are the Country Code, the next 2 denote the Year and Month (KK = 2011 November) and the last number denotes the Revision.

Country Code:

CE---> Belgium, Luxembourg, Netherlands
DC---> Thailand
DD---> India
DX---> Indonesia, Malaysia, Philippines, Singapore, Vietnam
DZ---> Malaysia, Singapore
JA---> South Africa
JC---> Algeria, Morocco, Nigeria, South Africa, Tunisia
JP---> Arabic, Algeria, Egypt, Iran, Iraq, Kuwait, Morocco, Nigeria, Oman, Pakistan, Saudi Arabia, Syria
JV---> Tunisia, Turkey
UG---> North America
UH---> Latin America, The Caribbean
XE--->	Bulgaria, Estonia, Kazakhstan, Latvia, Lithuania, Russia, Ukraine
XX---> Austria, Belgium, France, Germany, Hungary, United Kingdom
XW---> Austria, Belgium, France, Germany, Hungary, Italy, Nordic, Spain, United Kingdom
ZC---> China, Hong Kong
ZH---> Hong Kong
ZS---> China, Hong Kong
ZT---> Taiwan