As I understand it from my electrnics theory many moons ago, each individual cell has to be the capacity that it's stated at, so those IP cells you've pictured each cell would be 3.7V, 5400Mah, 60c.
When you wire them together in series you'll end up with 7.4V, 5400Mah (as when you connect in series you increase the voltage but the capacity stays the same. Conversly, if you were to wire them up in parallel you'd end up with a 3.7v, 10800Mah battery).
Hope that helps.
Ian
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