Plastic wrote, on 14/Feb/11 20:50 | Feb14:
On Mon, Feb 14, 2011 at 2:09 PM, Tony Firshman<[email protected]> wrote:
On 14 Feb 2011, at 20:01, Plastic<[email protected]> wrote:
<snip>
Is the CR2032 man enough though?
The CR2032 is 3V 235ma, and on this card would need to be replaced
every
three years or so, which would be a simple "pop a new one in"
operation...
The 40LF220 had a lower current capacity but was designed for a long
shelf
life of ten years, hence the bulk. So yes, the CR2032 truly fits this
application.
The format is standard for battery backed clocks on PCs, but was quite
new
in the late 80s.
I will look at current costs for getting a batch of 100 of these tiny,
single layer PCBs made.
Couldn't the card have a battery socket so that only the battery need
be
replaced?
( ... and why are you not yet living Texas time - it is 2am (8-)# )
That is exactly what I was describing ;) A simple adaptor card to a
CR2032
socket, and a CR2032 battery.
Ah sorry.
3 years though seems a mite short. I wonder if there is a more beefier
battery that is thin enough - or maybe a chargeable one?
There is, but it has 50% higher capacity and costs $12 instead of $0.99 at
the supermarket. I said three years as a minimum. It's quite possible that
it would last 5-6-7 years - I'm just being very conservative. Also, the
CR2032socket in bulk is under $1, but the socket for the CR2045 is $7.80 in
bulk.
I think people will happily pay $15-20 for a 3-5 year battery change at 99p
than pay $25-$30 for an extra couple of years. Also, changing the CR2032
batteries is so easy... 15 seconds, including removing and re-inserting the
card.
Yes - in that case the 2032 makes sense.
It is a pity the PC has stadardised now on the low capacity
non-rechargeable. In the old days they used a Minerva like NiCad pack
that lasted for yonks.
Tony
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