Reply With Quote370 is a high drain battery usually for alarm calibres where as the 371 is low drain fro time only calibres.
That said the 371 is what you need and is what is referenced for the ETA 255.461 which the Omega movement is based on.
Hi,
I have a couple of Omega Seamaster quartz divers reference 2221 8000 with the 1538 calibre movement.
Bought new years ago and it seemed ages before they needed their first battery.
Just under three years ago, I had both batteries replaced by a fairly local watch shop/ repairer.
Earlier this month one of them stopped so as the case backs were on tight, I paid just to have the backs loosened and I’ll sort the battery out myself. I can tighten it back up enough for me.
So the most recent battery was a Renata 370 but I was surprised that it conked out at less than three years.
I have read that the 371 is the correct battery
But then again, some folks fit a 395.
So we need an Omega expert on the job, which is the corrrct battery for my watch listed above?
Also, I cannot find a definite answer telling me the difference between the 370 and the 371?
Cheers,
Peter
370 is a high drain battery usually for alarm calibres where as the 371 is low drain fro time only calibres.
That said the 371 is what you need and is what is referenced for the ETA 255.461 which the Omega movement is based on.
Cheers,
Ben
..... for I have become the Jedi of flippers
" an extravagance is anything you buy that is of no earthly use to your wife "
Thank you for the information. Other research suggests I need to get hold of a battery limiting spring that sits on the top of the battery and holds the battery under tension when the caseback is added.
Is this true and if so, does anyone have a reference to this part?
Just my 2 cents, owning a couple of SMP quartz myself, though earlier than yours. I'd be speaking to Omega or, at least, an Omega specialist first. It's (in the main) all about the battery height versus case. The 395 is 2.7mm thick and you could damage the dial/mvt by using it. The 371 is 2.05 mm, but might have a spring fitting to stop it coming loose (dunno).
My 2264 has a 373 fitted (by an Omega specialist) which is even thinner at 1.65mm!
Things were not helped when Renata (I think) changed the dimensions of one of the batteries that were being used by Omega back then.
722520010601 or 72216804412 | BATTERY LIMITING SPRING - two sources/two numbers - gawd knows which is correct. But you probably will have to use a specialist to get one - that's if it's needed oc
It's a slight minefield tbh and there's a heck of a lot of confusion on the net about it all, hence my suggestion to go straight to the source. Better safe than sorry.
Last edited by Mouse; 22nd March 2024 at 23:48.
I believe the Renata 370 and 371 are the same dimensions and the 370 was in the watches when they were opened today.
So it looks like the 371 is the battery to go for. I have discovered that for extra cost there is a 371 EOL that appears to have an extended life compared to the standard Renata 371. Anyone had any experience of these?
You'll get three to three and a half years out of a 371. Have no experience (or heard of) the 'EOL' version, sorry.
According to the Renata website they produce a 371 and a 371 (OEM). The only difference I can spot on their respective Technical Data Sheets (from that site) is in the discharge curve.Originally Posted by PeterT
I had a look on Cousins and they sell a Renata 371 EOL premium extended life battery. They cost more than the standard 371 but it is pence more in reality.
I’ve bought these watches since new maybe 14 years and the original batteries lasted way longer than recent changes. Maybe the OE batteries were similar to what I have purchased?
I’ve taken control of battery changes now after having the case backs just loosened yesterday.
As I never intentionally get my watches wet, my Bergeron ball will keep the casebacks tight enough from my point of view.
When a quartz watch is chewing through batteries too quickly, it may need servicing.
Reading the blurb on the Cousins website, I believe that what they show as the mercury free premium (MPE) range are what Renata list as their OEM versions. Cousins say:
Renata has developed this high performance, extended end of life battery for premium, high end watches. The new batteries were tested by various independent laboratories and approved by several important OEM customers. Most of the major luxurious Swiss Watch Brands rely on Renata.
That they are "Extended End of Life (EOL optimised)" vesions would seem to tie up with the discharge curves I noted above.
That range is also available from H S Walsh...link...but not through their eBay store.
A Google search for "Renata 371 MP-E" will find other suppliers.
Last edited by PickleB; 23rd March 2024 at 22:54.
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