Help for batteries needed

Hello everyone, I am trying to make a diy board and have chosen all of the parts except for the battery. Can someone please break down what each stat means watts, volt, mah, discharge, amps, etc in terms of the board performance. Also, I found this battery for a pretty good price would I be better off making a battery using Samsung 18650 25r cells or buying the pre built battery. Which one is better value? What would the specs of the DIY battery be? Any help would be appreciated. Thanks


Is where everyone has gone

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