Thank you for this guide and the link to the replacement battery.
The battery I received had an extra circuit board and the contacts/metal bands were thinner and further apart thus making direct replacement difficult, there was no way to create proper connection with the spring contacts using the black plastic pc . I ended up removing the extra PCB and soldered the battery with short leads directly to the spring contacts and this worked well.
Unfortunately, it seems the battery wasn't the only issue with the watch.. last night it was fully charged however by this morning it was almost totally empty.
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