I just found this:
Optimize the battery Power:
Basically to optimize the battery power there are several factors which needs to be considered right from the signal strength to the network configuration to the environmental temperatures to the settings and features which you select or opt as the usage pattern of every single user depends and varies a lot which in short decides the battery level or the battery pattern and not to forget the data and voice pattern too decides a lot in the battery power. To increase battery performance you can turn off Bluetooth, GPS, Mobile network, Wi-Fi, notifications and other options that you may not frequently use. You can also decrease the screen brightness, the Screen timeout time. These are just few core and important things which you need to follow to optimize the battery power.
Like it’s mentioned that lot depends on the usage pattern, one has to ensure that the longer the use of multimedia and voice or data usage the faster will be the battery drain. So, this doesn’t mean that you should completely turn off the usage of your phone and keep the phone in the idle mode but some of the core functionalities like camera, Blue tooth, WiFi, GPS and with the use of continuous data you are sure to be at the end of battery life as with the simultaneous usage of such usage pattern the battery life tends to drain the fastest. Many of the users have the tendency to put the phone in the full brightness mode but such usage pattern actually degrades the battery life very quickly and also its either recommended to set the brightness level to either automatic or to the minimum level as per your requirement.
We all love setting up the wallpapers which are either rich in colours or have the motion wallpapers like Live wall papers but actually this is the biggest battery drainer as what happens exactly is due to continuous motion on the screen of the Live wallpapers, the screen tends to move and hence which eats up the battery power to the maximum as it’s a continual process. Also, it’s recommended to use the darker wallpapers rather than lighter wallpapers as to glow up lighter wallpapers it will require more battery life and with darker wallpapers it requires less battery life as there’s not much to glow up in the darker wallpapers.
Also, it’s very important that you always make use of the original accessories for charging your phone like original Charger and the original battery as the duplicate accessories may even spoil your phone as the ratings are compromised with. Also, it’s not advised to charge via the USB charging as in fact this trickles the charge which is not good for the battery and always use the AC Chargers. It will take a flat 3 hours of time to charge your HTC Droid Eris, but it may take longer when you charge with the USB charger.
Use Power Widget:
With the help of the power control widget you can control host of things with just one simple widget you can control 5 different things which are Wi Fi, Bluetooth, GPS, Sync and also the brightness can be controlled. If the battery is less then you need to ensure that all of these options are turned Off so that there is no way that the battery is wasted by these core features which eat up most of the battery charge.