How to have a long Standby and Battery -life? Possible Duplicate:
  What can I do to increase battery life on my Android device?  




My Huawei Android is dead after one day. I am looking for


ways to extend the battery life 
a new Android -phone with long battery-life (3. hopefully a phone with two Sim -cards)


I don't know what I really need. For 1, the Wifi/3D-all-the-time-on eats battery -- but hey I like to read my emails on phone. For 2, I could buy more bulky phone. For 3, something here (not sure about the quality). Look I currently use my non-3G iPad with long battery -life, I could buy the 3G version to alleviate the battery problem. I also use Nokia 9300 or Nokia 1111 with 1 week battery life. 

With Wifi/3G -problem, is it possible to have them in some energy -saving mode. 1 day battery in Android phones is totally ridiculous. How can I get long battery life?
Regarding this two parts of your question:

...ways to extend the battery life...
...With Wifi/3G -problem, is it possible to have them in some energy -saving mode...

I own a Huawei U8510-1 (Android 2.3.4 Gingerbread) and I also had to deal with that battery issue. When I've bought it, my battery lasted a day, forcing me to recharge it every night.
After some tests, by disabling and enabling stuff, I was able to give it a slight increase, specially when I've disabled the 3G, leaving only the WiFi.
, but couldn't get it to pass two days without a recharge.
The best solution I've found till the present day was this APP:

Easy Battery Saver free

Save power, extend battery life and perfect experience of using phone with Easy Battery Saver!



It works and really makes a difference. I'm able to control every small detail regarding what my phone should or shouldn't be doing, down to what apps can use 3G or WiFi. Now I charge my phone one, max two times a week, depending on the usage. :)