What size battery do i need for the armitron 20/4309TT

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This is the most likely cause

Tip & How-To about Watches

Changing Watch Batteries
Lots of posters ask "what is the battery in my (name of watch)" with a view to changing it yourself. This is a bad idea for many reasons. You don't have the tools or knowledge to remove a rotary screw on back, or the gasket sealant for a waterproof watch. Some fashion watches have 4 traditional screw and need professional grade jeweler screwdrivers. Also, there are about 20 batteries commonly used in watches, in various sizes and internal technology, Lithium Ion, Silver Oxide and Manganese Alkaline. If you buy them, you generally have to buy 10!

Don't sweat the details. Just take the watch to your local jeweler. They have all the batteries at hand and the tools to remove the back. It is done whilst you wait for $8 to $15!

Posted by ADMIN... on Dec 31, 2018

D379, 379 SR63

If the watch #/size is not printed on the back of the watch, you will actually have to remove the battery to figure out what size you need. Best regards.

Take your watch to your nearest watch shop and ask them to do it for you.

You can get into difficulty replacing batteries and it is not worth the risk for the small cost saving.

You are going to need professional help for this one.

Recommendation:
Take your watch to your local watch repair shop they have a watch press that will press the back cover on.

Hope this tip helps.

R/
David

Give us : make, model and all the writings on caseback. Photo will make it easy as well.