Hi McGlencoe,
what sort of battery were you using ? brand? capacity each?
From your last post i thought it was down to your batteries not delivering anything like 5000ma for them to last so short a time... But it made me go back and reevaluate what i'm using...
To add a little science to it I've made myself a very simple Torch Burn Time logger, now I've not tried it with the dive torch yet ( I need to work on the cooling!) but using a similar specified torch (2.2A at tail) I can record a 50-55min run time off a single battery using both my battery types (Trustfire from Dealextreme 2500ma and an Xtar 2600ma from Amazon.).
So i'm thinking, are your batteries really delivering the capacity they claim?
But like you, I noticed, that one of my three has started to flicker slightly, it doesn't show up on the video ( 25fps) so i don't care too much but not sure what is causing it yet... I replaced the battery and it made no change to the flicker so i don't think that is it.
What else could cause the flicker ? connections? Have I bodged it too far ;~)