Highest iOS in Original iPad without Jailbreaking

[RAMtheSSD]

I would want an iPad Air 2 but what I have is a first gen iPad. For security more than anything else, I would like to update from iOS 5.1.1 to at least 6 but 7 would be preferred as there are apps that need iOS 7 and old ones are not available without the jailbreak. I know that there are several ways to get around Apple's restrictions on what Mac can take what version of OS X; is there such a thing for the iPad?

Also, real world battery life, how long and when would you (or have you) change yours

Thanks

 

[Rodster]

The 1st gen iPad only supports up to iOS 5.

 

[BrianBaughn]

Yes, 5.1.1 is the last version of iOS on the original and it struggles running it.