Matched cells have been charged and discharged with their respective runtimes/capacity/internal resistance etc recorded. Then they are grouped together with other cells that have the exact same properties (or nearly exact...depends on how much you want to spend $$$$$).
This results in a pack that has a more consistant runtime and discharge rate. Was super important back in the day with RC racing when we had only 1200 mah packs (and smaller!) and 4-5 min races. You needed every ounce of current when running a hot motor/gearing and still make the full 4 mins.
For airsoft, don't even worry about it. Just buy the biggest mah pack you can afford and enjoy, discharge curves/run rates and internal resistance just isn't a big deal for the average AEG skirmish.
In other words, for the price of one matched pack, buy two large capacity packs :-)
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