Decent cr2032 batteries that don’t cost the earth

[Spare tyre]

I have a beam sensor across my driveway, which triggers a door bell push

The door bell push is powered by a cr2032 cell

Also all the alarm sensors in my house are 2032

Recently the bell,push has been going through batteries quickly, I’m guessing the colder weather perhaps

I was buying blister packs of 10 from IKEA for I dunno, £2.50 ish

Can anyone recommend a decent brand / source, do t want to go too mad, but also want to know when someone is on my drive

Cheers

[pquinn]

The trick is finding non-fake stock of the decent ones that are well within date.

Amazon is a minefield for a start.

[craig1912]

https://www.ikea.com/gb/en/p/plattboj-lithium-batt...

These are available online

[frisbee]

pquinn said:

The trick is finding non-fake stock of the decent ones that are well within date.

Amazon is a minefield for a start.

I use them in a lot of cycling sensors and a light. I've got on pretty well with random Amazon ones.

A light worked a lot better with some paper wedged behind the batteries. I don't know if there is variation in the thickness of the batteries or if the sprung arms start flattening.

[littleredrooster]

Just as an aside, I've come to the conclusion that Ikea batteries are universally dreadful. I thought our telly remote must be a high-drain device after replacing loads of Ikea alkaline cells in them, then I tried Duracell and haven't replaced any since! Ditto for button-cells in a pocket torch and a central-locking fob.

[David_M]

frisbee said:

I use them in a lot of cycling sensors and a light. I've got on pretty well with random Amazon ones.

A light worked a lot better with some paper wedged behind the batteries. I don't know if there is variation in the thickness of the batteries or if the sprung arms start flattening.

Here's a boring thing that I learned recently - the numbers are diameter in mm / thickness in mm x 10 - so a 2032 is 20mm diameter and 3.2mm thickness and a 2025 is 20mm diameter and 2.5mm thickness. They are the same voltage.

Which is "interesting" - but maybe if the paper is needed then perhaps it is worth checking what battery thickness is spec'd?

[Aunty Pasty]

I usually buy Panasonic ones from Amazon. There are some ones from unknown brands on there which are utterly crap but I've been ok with Panasonic ones.

[kev b]

I kept having to replace batteries in my key fob, using Duracell, finally after the last one died I fitted a cheap Lidl sourced one and it has outlasted the Duracell ones many times over.

Maybe the Duracells were fakes?

[RDBx]

Second binning the IKEA ones. We have a pack for the kitchen scales, needs replacing every 3 or 4 months, the original battery lasted years.

[Joe M]

Duracell from ebay, just find a genuine seller.

[Happy Jim]

David_M said:

frisbee said:

I use them in a lot of cycling sensors and a light. I've got on pretty well with random Amazon ones.

A light worked a lot better with some paper wedged behind the batteries. I don't know if there is variation in the thickness of the batteries or if the sprung arms start flattening.

Here's a boring thing that I learned recently - the numbers are diameter in mm / thickness in mm x 10 - so a 2032 is 20mm diameter and 3.2mm thickness and a 2025 is 20mm diameter and 2.5mm thickness. They are the same voltage.

Which is "interesting" - but maybe if the paper is needed then perhaps it is worth checking what battery thickness is spec'd?

Well I never knew that! Thank you!

[Toltec]

David_M said:

Here's a boring thing that I learned recently - the numbers are diameter in mm / thickness in mm x 10 - so a 2032 is 20mm diameter and 3.2mm thickness and a 2025 is 20mm diameter and 2.5mm thickness. They are the same voltage.

Which is "interesting" - but maybe if the paper is needed then perhaps it is worth checking what battery thickness is spec'd?

Same for the big lithium cells, an 18650 is 18mm diameter by 65.0mm long.