Quote:
Originally Posted by shadyr25
Yep, I use a custom rom made by a certain group called Hyperdriod. I've been running there roms since 2006 hd2 days. The rom itself is called hyperdroid androidmeda. I use redpill kernal which is also made by them. Regarding modems, I've found LPS to perform great and battery friendly too.
The best thing is, their rom is based off Samsung official stock rom, so everything is guaranteed working.
It has also been specially undervolted using magic config by gecko which also helps with the battery.
That's it really.
Props to all the developers for their hard work. Hyperdroid team are very hard working experienced bunch while maintaining their life. So you know you're gonna expect nothing but the best
here's the link to their rom:
http://forum.xda-developers.com/show....php?t=1462227
It's on the latest gingerbread.
Here's the link to magic config:
http://forum.xda-developers.com/show....php?t=1466017
Hope this helps someone, anyone and everyone 
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Sorry for answering very late ,
But as I see from your talk
It 's not that much bigger difference , as both , the 2000 mh and the pack are official products from samsung . And from the specs I see the pack has more power ,
For me , I've tried few of custom ROMs , it always have bugs and Issues and need frequently regularly updated , so it 's annoying , compared to officialy stock every year or something it gets updated , plus you're talking about android 2.3.x which is not the last version although it offers better battery life , I prefer stock ICS 4.0.x Based ROMs anyways
Also , you 're talking about undervolting , which for me , very unstable ,and always the phone FC , and restarts a lot , and freezes and slows down ...
I didn't buy a 1.2 dual core to undervolt it to 800 or 1000
And iF it is granted working with no issues , I think samsung would do it in the first place .
So changing in configartion , is not fair in comparison .
From changing between ROMs , yeah , battery life changes dramaticaly , and with some extra apps like Facebook , twitter , skype , whatsapp , or some feeds or RSS ,that's to say with getting benfits of the phone , battery drains a lot quicker .
So it is fair to say the power pack add 40 - 45 % to the battery whatsoever ..
If it lasts 6 hours normaly so it will be 8 - 9 h
So if you want to compare , compare it to the original battery of yours , with same usage , not mine ,
And as you've said 5-6 h normaly to 8 ..it adds as the same or maybe less than the power pack .
Sent from my GT-I9100 using xda app-developers app