HTC myTouch 3G Slide Manuel D’Utilisation

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Settings       173
Optimizing your phone’s battery life
When  you’re  on  the go,  it’s  not  always easy  to  charge  your  phone’s  battery  as  often  as  you’d
like. Follow these tips to extend the time between charges: 
 
Turn off wireless functions such as Bluetooth, Wi-Fi, and data connection when you’re not 
using them. See the Internet and Bluetooth chapters for details.
 
Use only GSM networks. See "Using the GSM network of T-Mobile" for details.
 
Do not use GPS satellites to determine your GPS location. See the "Maps and location" 
chapter for details. 
 
Lower the screen brightness. See "Adjusting the screen brightness manually" for details.
 
 
Cut down on activities such as Internet browsing. Wireless data consumes a lot of power.
 
Avoid making very long phone calls or using the camera for extended periods of time.
 
Consider carrying a spare battery for times when you can’t charge your battery for an 
extended period.
 
Batteries gradually lose storage capacity over time. Consider replacing your battery after 
eight months to a year, or if you notice that the battery life is decreasing.
Using the GSM network of T-Mobile
Switch to using the GSM network of T-Mobile if you are not using a data connection to connect
to the Internet. Connecting to your T-Mobile’s GSM network consumes less battery power. 
1.  Press HOME > MENU, and then tap Settings > Wireless & networks.
2. Scroll down the screen, and then tap Mobile networks > Network mode.
3. Tap GSM only. 
Checking the power usage of applications
1.  Press HOME > MENU, and then tap Settings.
2. Scroll down the screen, and then tap About phone > Battery > Battery use.