Memomaster

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Hi
I have a Memomaster 1632 watch. I fitted new batteries about three months ago and the display is blinking today. The manual tells me that this means I should replace the batteries. I assume I’ve put in batteries of a poor quality which do t last very long, or maybe this watch demands a lot of power?
Can someone please advise the best type of batteries to use so that I get the longest life from them?
Thanks