Ah man what a flashback to my yout. 4 AA batteries and the beam went from weak to barely visible in about an hour.
2 x D surely?
Now you mention it, yes, that sounds more like it.
I could check at some point as my dad still has at least one of these attached to his bike.
@efb started
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Ah man what a flashback to my yout. 4 AA batteries and the beam went from weak to barely visible in about an hour.