Leelee has it spot on.
A cheap and crude way to check cells under load would be to place a low ohm high power resistor in parallel with your voltmeter. Check the resting voltage before doing this (without the resistor) for reference though.
If the cell voltages drop when under load, the internal resistance will be high hence premature low voltages.
You don't need to use a resistor, but it's an ideal load and can be tailored for your use.
Personally, i'm not a big fan of Turnigy cells and have noticed a fair loss in performance from them within about 90 cycles of usage.
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