Battery keeps popping out - Seiko 7n36 6a40

[Kruttskjegg]

Hi everybody. This is my first real thread here (except my introduction post) and sadly it's not related to a mechanical movement, but a cheap quarts. 
A friend of mine had given his old dive watch to his son, but it stopped. Someone (not sure if it was a watchmaker) changed the battery, but this only fixed the problem for a short period. 

So he dropped it off for me to look at. Im new to watchmaking in general, but when it comes to quarts my knowledge is about zero. I have changed some batteries before. Thats pretty much it. 

 

Shouldn't something be keeping this movement in place? Is something missing?  What are the two holes in the back? 

I did try to put a new battery in, but its impossible to "click" it into place. It just pops right out, and I can't see anything that is supposed to help it stay in place. Do you see anything wrong here?


Here is the battery, I have double checked its the right one:


I could use some tape and paper together with the back of the movement to press the battery in place, but this seems a bit sketchy right? 
The watch works as long as I press in the battery. 

I would be very thankful for any help!

[RichardHarris123]

Difficult to tell from your photos but have a look at the attached, the bit that pushes against the positive side looks different.  It might need slightly bending.  Please be aware, I don't work on quartz. 

[AndyGSi]

The contact has corroded away.

[HectorLooi]

The battery needs to go under the two ledges arrowed in the above picture.

[AndyGSi]

8 minutes ago, HectorLooi said:

The battery needs to go under the two ledges arrowed in the above picture.

The Battery doesn't go under them it presses against them with the smallest of hooks on the right which is missing off the OPs.

 

Edited July 16, 2024 by AndyGSi

[Kruttskjegg]

Thank you so much. This part seems to be missing from this watch, unfortunately. I see that I can buy a whole new movement very cheaply. Would you say it's easy to put in a new movement? I could have done it with a mechanical watch, but I know nothing about quarts. 

 

[AndyGSi]

I'm surprised you can find a cheap NOS 7N36 but if you can then it should be a simple swap of stem, dial & hands.

Edit

Make sure the new movement is also marked with a 2 as this is the hands height.

Edited July 17, 2024 by AndyGSi

[Kruttskjegg]

Thank you so much AndyGSI. Really appreciate it!

I was thinking of this movement. It says is compatible with the SHC039 which is this model:
https://www.watchplaza.com/us/seiko-u7n3620-quartz-movement-7n36-0af0-0ab0-0ag0.html


 

[AndyGSi]

14 minutes ago, Kruttskjegg said:

I was thinking of this movement. It says is compatible with the SHC039 which is this model:
https://www.watchplaza.com/us/seiko-u7n3620-quartz-movement-7n36-0af0-0ab0-0ag0.html

Yes that's what you need and it's got the correct day/date dials too which was something else I was going to mention.

Obviously easier and cheaper to get hold of in Europe than here in the UK.

[Kruttskjegg]

Thanks man! I seems like I ordered the very last one they had.