Alpina Seastrong GMT battery?

Hello, does anybody know what battery this watch uses?  Can't seem to find the info anywhere and I don't have the watch with me.  I want to order a battery so I have it when I return home.  Alpina AL-247.  Thanks!

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I lost a battery in a watch before I could order it's replacement once. 

Sent an email to Customer Support and I had an answer in under 24 hours. 

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Might be the Renata 371?

https://www.amazon.com/Renata-SR920SW-Mercury-Electronic-Batteries/dp/B00MU3FWUS/ref=asc_df_B00MU3FWUS/?tag=hyprod-20&linkCode=df0&hvadid=309760520871&hvpos=&hvnetw=g&hvrand=1144129785385437327&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9013168&hvtargid=pla-570070282761&psc=1

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I have a pending email to customer support at Alpina.  Thanks for the suggestion