Ive never had an issue with Motorola cameras, and everyone seems to forget the main point of dual core isnt just better processing power, but each core can run at a much lower voltage, increasing battery life, not hurting it. The only thing thats going to effect battery life is the user, and 4G which is going to be across the board, not phone specific.
Your statement about "Much Lower Voltage" increasing battery life is slightly exaggerated.
The amount of voltage needed is a product of how much potential is required to reach the forward bias of all the transistors in the path of the computation/instruction execution along with the frequency (faster = less time spent and requires higher voltage to overcome this issue) of the the electrons as they travel thru this path. Since "Dual Cores" have more active transistors due to both CPUs executing some form of code at all times, your theory of increasing battery life is counter to the physical requirements of the transistor based technology being used.
BUT.....
Before you run off and spend sometime with Google trying to prove my explanation wrong, let me clear up a few facts ahead of time for you.
1) Dual Core uses less power than two Single core CPUs. This is fact, because the number of support chips needed are reduced. But that really has nothing to do with your statement.
On the other hand though....
2) Dual Core uses smaller traces (IE die size) which require less power. Fact, but since there are more transistor now running at the same time, the slightly lowered voltage gain is lost by the amount of electrons used to support both cores running at the same speed as a "Single Core" CPU at full speed.
So where doe your statement start to hold water when it comes "Dual Core" CPUs? You can run a "Dual Core" CPU at a lower speed which equates to needing less voltage, which means you will use less power but still be more powerful than that of a "Single Core" CPU overall.
No argument there what-so-ever.
But that savings is going to be less than 10% of the overall battery life of the phone. Mainly because they are going to sell these "Dual Core" phones with clock speeds of 1Ghz or higher which is what "Single Core" phones are already running at.
Now for the kicker. The 4G radio chips are going to be eating more power then 3G chips. Two reasons for that.
1) They are brand new and still need refining.
2) They have higher data throughput and hence need faster chips sets which lead to the whole "need more voltage" the faster you go.
Also, the display of the phone usually eats more power than any other subsystem. So to really see power gains, that is where the breakthroughs will need to be made.
So, long story short. Expect the first generation "Dual Core" phones to have worse battery life over current "Single Core" phones to begin with. And as manufacturing refinements increase, your statement will finally come into parity.
