T420s - best 8 hours battery setup

Hello Community,
I just bough T420s 4GB RAm, 128SSD to my girlfriend and she is SO happy. The laptop is one sexy beast.
However, I was surprized by the size of the main battery. It is tiny , like a chocolate bar So , I expected a tiny battery life as well. It looks like with WiFi and decent Screen brightness it is about 3+ hours.
Charger is 65 watt and super small and it is not a problem to bring it around. Still, I was thinking what is the best way to extend battery life to 8 hours working day.
My current idea:
Buy 2 additional main batteries and 2 external batery chargers.
Charge these 2 extra batteries every day Get them along with laptop.
So at the end my girl friend will have: Laptop with 1 installed battery and 2 extra batteries.
Assuming one battery gives 3.5 hours of active usage time it brings us to about 10 hours battery life.
Batteries are super small a tiny , so bringing them along in her school bag (she is a student) should not be a problem.
How do you see this setup? May be you have bettter ideas how to achieve 10 hours active usage time with less hassle?

almalino wrote:
thinkfly,
How do you use your laptop? I get between 3 and 4 hours on main 6 cell battery using WiFi and MS office. I barely can imagine adding smaller 3 cell battery and get additinoal 4 hours out of it. 
I use WiFi and run 2 virtual machines, for coding and web browsing mainly. I don't do computing jobs on my T420s. Open your Power Manager and check the idle wattage. If your idle power consumption is more than 12 watts then you probably need to optimize your system e.g. check which applications are occupying your CPU.

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