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With an external battery pack NiMh batteries should be used, 4*1.25v= 5v which is the input voltage for the H140, plus NiMh batteries have a higher amp/hour rating than Alkalines with a lower voltage drop off.
If you use Alkaline batteries the external battery pack might not work until the pack output voltage drops below the 5v threshold, output voltage with four Alkaline batteries 4*1.5v=6v.
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