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. 2015 May 12;5:10093. doi: 10.1038/srep10093

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In (A) battery voltage over time under continuous drain with a 9 V battery source is compared to 3 AA (1.5 V) batteries in series showing a brief period of high voltage operation but rapid drain in the former, versus relatively stable output in the latter. Further characterization of LED power output over extended period of continuous drain using 3 AA batteries is shown in (B) In (C) LED power output over time for 15 minute bursts followed by 5 minute rest periods (again using the more stable 3 AA battery pack) is shown to extend battery life due to partial recovery after each burst.