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How do I know what battery I need for c&k securitech co23-203 and any help on how to change it would be gratefully received

Does anyone know what battery is required for c&k securitech co23-203 iss 1 we had a power cut last night and the alarm bell was ringing out side with no way to stop it. I done a bit of digging and discovered my battery needs renewed, I am not sure how to do it or what to buy or even where to...