Via reddit:

[–]RockItGuyDC 297 points 21 hours ago

This post is from idevicenews

Step forward the BattSaver package, by well known developer and friend of the jailbreak community Xvolks, and backed by famous iOS jailbreak developer Pod2g. Cydia contains a number of battery managing tweaks which seem to be cleverly worded to give the impression of power improvement, but actually, what they do is just allow users to see what is draining the battery, view the maximum and current capacities and a few other bits and bobs that isn’t exactly useful to the user. BattSaver on the other hand makes the bold claim that it can double the battery life on the jailbroken device and provide a distinct and noticeable improvement to the user.

The power of the BattSaver package comes from its behind-the-scenes code that is intelligent enough to monitor the system and automatically switches off anything that is not being used and could be a potential battery drainer. You would actually be surprised at how many different things lie dormant on an iOS device, but still feel the need to consume battery life. The main selling point of this package is the efficiency which it claims to provide to the user. Given the fact that an iPhone has an almost endless amount of uses due to the ability to download additional apps from the App Store, battery life is imperative to that functionality. No battery means no usage, and that is why being able to double the battery life is such a valuable commodity.

BattSaver also comes with built-in power strategies that define how aggressively the device should cling on to that precious power. Ranging from normal to custom, each strategy has a different set of criteria which involves turning off all radios when not in use, as well as setting certain power saving mechanisms to kick in when the battery level reaches a certain percentage. If you have a jailbroken iPhone that is in dire need of some power conversation, then the BattSaver tweak is most definitely for you.

There are a few other neat features.
CPU Load shows the load on your device’s processor as well as System information lets you know about your device’s unique id, MAC address, IP Address, device name and model, OS Version, CPU and Bus Frequency and your device’s last boot time i.e. last time when you switched on your device.

System Monitor with Battery Max 1.7 is $0.99 USD (or equivalent amount in other currencies) and available worldwide exclusively through the App Store in the Productivity category.

System Monitor with Battery Max 1.7: http://sysmon.tektontek.com
Purchase and Download: http://itunes.apple.com/app/system-monitor-battery-max/id386118145
YouTube Video: http://www.youtube.com/watch?v=0rlN7swPplI
Screenshot (Speedometer View): http://i974.photobucket.com/albums/ae224/tektontek/System%20Monitor%20with%20Battery%20Max/freeusedprocess.png
Screenshot (Memory, CPU and Disk): http://i974.photobucket.com/albums/ae224/tektontek/System%20Monitor%20with%20Battery%20Max/help3.png
App Icon: http://a3.mzstatic.com/us/r1000/067/Purple/1e/c4/c8/mzl.lflbghlb.175×175-75.jpg

Well, at least at first.  And it make sense this would be the case.  In fact, I’m sure COCO programmers have already been into their code and prepping how they want it to function on the larger device using the emulator. And actually, I’m really interested to see how well this thing can handle ported 3D games.

There are going to be plenty of readers out there when the iPad drops on the third, but I think the real gold rush will be around games.  There are tonnes of games on the iPhone, but the screensize has always been a limitation.  So now image playing Spore seeing a nice large world to explore.  Or SimCity where you can really appriciate the Art and see your whole city running. Or wanna play a board game?  Well now, you have your board dont you?

All sounds great right??  The iPad will take gaming to the next level yea?  Well… Lets calm down for a sec. We still do not know if the iPad is going to be powerful enough to handle rendering a larger screen graph.  And its not just the larger size, but as with the SimCity example, there are more things to animate now that we can see more.  And what about battery life? Sure the 3D demo they gave us was impressive, but was that rebuilt from the ground up or ported? I can bet you dollars to donuts ( and what the heck does that expression even mean? … Isn’t a doughnut more then a dollar now a days?) that the battery life will be WAY shorter if you are game playing.. Especially 3D.

Better game play will be my second reason for getting an iPad,  My top reason for getting an iPad will be to remote access my desktop.  And even then, I still plan on getting a used one.

So if your battery life suddenly goes south on you, try turning off email, or at least set everything to fetch.  Could be the easy fix.