How to read a datasheet: what is measured, what is claimed, and what is missing.
Capacity, energy and cycle life claims
Check the test conditions: capacity at 0.5C and 25°C is not the same as what your application will see.
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Charge and discharge limits, temperature range
The continuous current rating and the temperature window are the two numbers that decide whether the pack suits the job.
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Questions
Short answers to the ones that come up most.
What does the capacity number mean?
Amp-hours at a stated current and temperature. Ask for the test conditions.
Which spec matters most?
The continuous current rating and the temperature window.
What is often missing from a datasheet?
Cycle life test conditions and the BMS configuration. Ask for both.