Sorry mate even that small/mild improvement can't save the device. That's why many of us would like an ipod touch 6.
Regarding the 2.6 hours of battery life that's pretty much the equivalent for your 18 hours on your ipad 2, simple maths.
Oh goodness, I never said that it will save the device. The obviously need an iPod Touch 6, but what I am saying is that doesn't mean they should drop The Touch 5 from support. Those who are content with A5 performance and want to keep their iPod (Understandably if you had bought it today for example) will find small increases quite good.
That battery thing is flawed. The iPad 2 has a much bigger screen, faster clocked Cpu and more intensive graphically apps. Thus the Touch 5 is completely different.