Not getting all that much life from a button cell (CR2025) in a remote control zapper, am wondering about cutting one in half, emptying the electrolyte, attaching (soldering?) 2 fine wires, then resealing with araldite so that the zapper can be run from a larger external battery pack or perhaps a mains adapter.
Presumably the elctrolyte is alkaline? What precautions are needed to handle & dispose of the electrolyte? Anyone done anything similar?
TIA for any comments
I would be inclined to check the zapper for a constant drain on the cell. Is a button stuck or has it been wet?
Would think it'd be easier to make something from a couple of metal discs.
Electrolyte depends on the chemistry of the cell. ISTR 2025 is lithium
Sounds like the 'zapper' is faulty. Unless it's being used for something it wasn't designed for.
Depends on the battery holder. Some use a radial contact to contact the larger pole, thus not requiring a contact in the lid (or any "lid" at all). These would be tricky to fake up from scratch.
snipped-for-privacy@k26g2000vbp.googlegroups.com...
Or stop buying button cells from the pound shop..!
I wondered about that myself when I saw silver oxide cells in the pound shop at 30 for a pound.
Derek
The ones on a blister card? I had a set and eventually used most of them in the kids watches, etc, that soometimes didn't last as long as the batteries!
MBQ
Well, yes.
I don't buy rubbish you know.
Derek
Would it not be easier to just tack a couple of wires onto the appropriate pad on the PCB and leave the cell out?
(don't try soldering to a dead cell BTW - they tend to go bang in your face)
Most are like that IME, a sliver of card or tape to insulate isnt difficult. Or you could just offset the 2 washers slightly, whatevers easiest.
NT
There must be contacts which touch the battery. Solder wires to those for your external battery pack and just leave the button cell out, surely?
(Talking of which, the battery in our medical thermometer died the other day - so there was me with some wires, hooking it up to a kids' toy walkie-talkie... we seem to have a million things at home which take button cells, and they're all of a sodding different type)
I would strongly advise against cutting open a lithium cell. Lithium is from the same chemical family as sodium and potassium. These metals are highly reactive especially with water. Even if the lithium is in a compound I'd avoid it unless absolutely necessary.
On Fri, 18 Sep 2009 19:54:46 GMT, "Jim Backus" had this to say:
This _is_ supposed to be a d-i-y group though...
Thanks for the responses. Sorry slightly more explanation was due. It is a camera remote control.
'not much life' was 3000 pics over 4 days - I'm not complaining except that a CR2032 might have more capacity AND be more readily obtainable. The only ways of snapping with this camera are by button pushing, risking camera shake - and use of the zapper. There is no ready way of attaching a wired remote control. Also I would wish to retain the facility to pop in a real CR2025 to return the zapper to spec. Hence interest in a dummy button cell. and avoiding modifications to the zapper.
which is why it needs draining of its contents fiirst.
As another poster said, it is a lithium cell which doesn't have the best press for fire etc safety.
My original thoughts were to saw/slice the cell across a diameter.
Could this be done safely under water?
Or perhaps in some other inert substance like clean dry sand?
Also my skills wouldn't be at their best trying to fake a cell from washers, too small for my big clumcy fingers - though I'd expect to be able to glue up a cur cell wuth araldite,
Hope that explains it better, thanks
J
delay timer? can't think of many camera's without this feature nowadays.
Remind me never to put salt on my chips again...
MSDS for lithium coin cells:
In message , Jim Backus writes
I always open them up and chuck the lithium in water - set light to the hydrogen too
... life in the fast lane
If it will fit
the first "20" refers to the diameter i.e.20mm the second "25" or"32" refers to the thickness 2.5 or 3.2mm
Reminds me of some dietician bint on the telly t'other day (might have been watchdog)
"sodium is a compound found in salt"
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