Sigma Pro HRM sems to eat batteries?

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Seems I'm in questions mode today

Anyone else got one of these?

Mine seems to be chomping its way through a lot of batteries lately, I seem to get the "low battery" signal very quickly and occaisonally a few days after changing for a new one, take it out give it a clean and its ok for a few days. It seems to be the chest strap rather than the head.
 
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