Cateye HL-EL135 battery life

Hi
I am not sure if I have a faulty unit, but my cateye HL-EL135 is getting through batteries at a rate of knots.

I use it on flashing mode, and only use it for about 2 hours a day, but reckon its sucking up a set of batteries every 3 weeks or so. (Duracells)
Does that sound wrong?
I am not sure if I have a faulty unit, but my cateye HL-EL135 is getting through batteries at a rate of knots.

I use it on flashing mode, and only use it for about 2 hours a day, but reckon its sucking up a set of batteries every 3 weeks or so. (Duracells)
Does that sound wrong?
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PX Kaffenback 2 = Work Horse
B-Twin Alur 700 = Sundays and Hills
I only let my rear 1w lights run for a few days before recharging !
Get these.
http://www.amazon.co.uk/Sanyo-Eneloop-Charger-Inc-Batteries/dp/B000N64EL2/ref=pd_sim_ce_7
Cube Attain
Everyday Commuter