Extended run time with Deal Extreme lights

I have been using the setup recomended in the what lights thread ie 5 mode P7 on the bars and 5 mode C1 on the helmet and am finding that I am getting far longer run times than quoted.
I regularly go out for 2 hour plus rides at night and the P7 hasn't run out of puff once.
I was prepared for and expected to have to change the P7 batteries every hour as quoted but this is simply not the case in reality.
Now I know that some of my riding, when on road for example, I use a lower setting on the light so I don't blind drivers, but this is only a small farction of my ride time.
Bare in mind that recent rides have also been in sub-zero temps too when battery life is not good.
I am so so impressed it's not true
Is anyone else finding this ?
I regularly go out for 2 hour plus rides at night and the P7 hasn't run out of puff once.
I was prepared for and expected to have to change the P7 batteries every hour as quoted but this is simply not the case in reality.
Now I know that some of my riding, when on road for example, I use a lower setting on the light so I don't blind drivers, but this is only a small farction of my ride time.
Bare in mind that recent rides have also been in sub-zero temps too when battery life is not good.
I am so so impressed it's not true

Is anyone else finding this ?
I ride therefore I am
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I get more than 3 hours on full power from the magicshine type light thing...
might just buy a second battery fro very long night rides.
perfect...
H.G. Wells.
must be a new wiring system.