Do you live in bad phone signal area?
remember your phone is not just only phone..its mini PC..with touch screen..and nothing comparing blackberry OS..thats why sometimes it needs more battery power
My suggestions is..
remove your unneccessary widget.
decreasing your icon on your home and put them at your 1 or 2 folder on your main home screen.
try to use dark wallpapper for your home..
decreasing your home screen to only 3 home will be help your battery to.
try to charge everytime while you are not using your phone
stop unnecessary auto sync app.
dont leave your dolphine hd app in the background..kill it after your browsing season over..
shutdown your phone screen ASAP after use it.
if above tips not work..
buy additional battery..my suggestion is..buy external battery charger.
i use Sanyo Mobile Booster 5000 mAh and very happy with it..
and the charging process of sanyo external battery is very fast..
below the pic and spec of my sanyo external battery
and please note i bought this in my local market..so you need to googling it or maybe try find one at ebay..
Sanyo Eneloop Mobile Booster w/ Xtra Strength KBC-L2S-SP
Description :
Mobile Booster with Xtra Strength ( Built in with 2p'cs of Lithium ion batteries)
Capacity : Up to 5000 mah
Function : As mentioned bellow
Charging times : AC Adaptor - 7 hrs or USB Port - 14 hrs
Built-in with 2 pieces of Lithium Ion batteries, the mobile booster Xtra is compact yet high in power. It acts as a back-up power for any electronic devices when its power is running low.
Applicable for portable music players, portable games, mobile phones (most models) and electronic devices that can be charged through USB port.
Contains:
* Li-ion Battery with 2 USB outputs and 1 DC input (KBC-L2)
* AC Adapter (Euro 2 pin)
* USB cable for charging KBC-L2
* Instructions Manual