是舊電池嗎? 閃完亮度有降一檔嗎?
若是, 應該是低電量指示.
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Low Battery Indication
Your flashlight will turn off momentarily and then back on one level below the previous brightness level when the battery is unable to supply enough power to run the current brightness level. This process is repeated as needed as the battery’s power is depleted. http://www.hdssystems.com/Products/Edc/EdcUsersGuide.pdf