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Invicta Reserve Mens Arsenal Swiss Quartz Stainless Steel Strap Watch - Page 3 Questions & Answers
What battery do I need for an Invicta diver 20478 please?
It appears you will be changing the battery yourself.
If so I would suggest to unscrew the case and read the ID on the battery. The Maxell reference guide will let you choose based on voltage, size, etc.
Be careful with an O-ring that keeps moisture out.
http://www.sauseng.at/download/prospekte/maxell/Micro_Battery_Cross_Reference_Guide.pdf
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