Eunicell SR44 … These are very cheap, but are they any good ?

[mechman48Participant @mechman48]

Seem to operate ok in my calipers, bought off eBay in packs of 5.

George.

[John PParticipant @johnp77052]

Hi Michael
My Mitutoyo is not so good on battery life as that but carries on working
showing the B sign and gradually the display fades ,the caliper above
the Mitutoyo i think was from Arc euro is a good caliper but the battery
life is very poor ,the other two also cheapy's have much the same fate.
The micrometers you can't turn off they go into a sleep mode which
drains the battery ,the inch sizes here are easy enough the set to zero
but the the other three in the set have to be reset with a standard to read
properly which is a right pain ,the larger batteries last a very long time.
Having all of these and having to have batteries in them about 10 or 11
batteries adds up ,the AAA s are cheaper in the long run and don't interfere
with the operation of the calipers.

John

[Michael GilliganParticipant @michaelgilligan61133]

Posted by mechman48 on 29/04/2020 18:59:37:

Seem to operate ok in my calipers, bought off eBay in packs of 5.

George.

.

Thanks, George

… That’s presumably an answer to my opening questions

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Pace on 29/04/2020 19:11:49:

Hi Michael

[…] the inch sizes here are easy enough the set to zero but the the other three in the set have to be reset with a standard to read properly which is a right pain ,the larger batteries last a very long time.
Having all of these and having to have batteries in them about 10 or 11 batteries adds up ,the AAA s are cheaper in the long run and don't interfere with the operation of the calipers.

John

.

Thanks, John … Understood.

MichaelG.

[peak4Participant @peak4]

I tend to stock up on button cells when Lidl have them on seasonal special offer.
They seem to work well enough, and certainly better than the Poundland type cheapo ones.

Bill

[Ron LadenParticipant @ronladen17547]

I came across Rayovac (Swiss made) on Ebay and it rang a bell as I used them in the Mitutoyo a few years back, I could buy them local in those days. Like Michael's Energisers they really did last and a good shelf life to.

Just ordered a twin pack for £3.15 free postage.

From the data sheet:

165 mAh – 4.7k OHM 24hour/daily discharge.

Storage loss less than 7% per year.

Ron

Edited By Ron Laden on 30/04/2020 06:16:40

[Michael GilliganParticipant @michaelgilligan61133]

UPDATE : As if by magic …

ebay has now started sending me listings for Renata Silver Oxide button cells

This one has a useful cross-reference chart : **LINK**

https://www.ebay.co.uk/itm/Genuine-Renata-Batteries-Swiss-Made-silver-oxide-Watch-Batteries-All-Sizes/274265959062

MichaelG.

[Former MemberParticipant @formermember32069]

[This posting has been removed]

[SillyOldDufferModerator @sillyoldduffer]

Posted by John Pace on 29/04/2020 19:11:49:

Hi Michael
My Mitutoyo is not so good on battery life as that but carries on working
showing the B sign and gradually the display fades ,the caliper above
the Mitutoyo i think was from Arc euro is a good caliper but the battery
life is very poor ,the other two also cheapy's have much the same fate.
The micrometers you can't turn off they go into a sleep mode which
drains the battery …

John

My pet theory is that poor battery life is caused by a combination of condensation and cheap calipers being very voltage sensitive. Measuring my various digital calipers showed they all consume about the same constant current when switched 'off', less than 10 microamps. Whatever causes the problem, it isn't being left 'ON'.

Energizer quote a capacity of 130mAH for their CR1632, that being measured at 19mA for 684 hours, taking the cell from 3 down to 2V. At 10 microamps, a CR1632 should last many years in a caliper apart from life limitations l due to internal decay, hence best before dates.

However, my cheapo Lidl caliper fails long before the cell is truly flat! A drop of 0.5V is enough to stop it working.

Also, cheap calipers are poorly sealed against moisture. They are much more vulnerable to condensation than a quality caliper with an IP rating.

So I suspect a little used cheap caliper kept scrupulously dry will get much better battery life than the same caliper well used in an ordinary workshop. The posh calipers are sealed against condensation and I guess their smarter electronics get more life out of cells by being less fussy about low volts.

Just a hypothesis – needs to be tested!

Dave

[Former MemberParticipant @formermember32069]

[This posting has been removed]

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