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Re: [IP] Batteries, batteries, and more batteries



Dan Oliver wrote:
> 
> Potentially boring information on the subject of batteries:
> 
> [If you don't give a whit about battery life, skip the rest of this...]
> 
> As most of you probably know, not all batteries are created equal.  There
> are many variables that affect a battery's service life _before_ it is even
> put into service.
> 
> Here are some notables:
> 
> 1. Manufacturer - different manufacturers use different materials and
> techniques when constructing their batteries.  Every tiny difference can
> affect the service life of a battery.  Even with the same manufacturer,
> differences in available materials over time can affect service life between
> production lots.
> 
> 2. Storage time - the longer a battery sits on the shelf, the shorter it's
> overall service life will be, since the chemical reactions that generate the
> electricity continue even when the battery is not in service.  This is
> related to something called the 'internal resistance' of a battery.
> 
> 3. Storage temperature - higher storage temperatures increase the
> abovementioned reaction rate, thereby shortening the service life.
> 
> These are just a few of the major variables that affect battery service
> life.  So, if you want to maximize the service life of the batteries that
> you buy, consider these recommendations:
> 
> a) Buy name-brand batteries.  They're more expensive, but there's a reason
> for it...quality of materials and consistency of performance.
> 
> b) Most battery manufacturers now put 'best-used-by' dates on their
> packages.  Batteries with the latest best-used-by dates were manufactured
> most recently.  When you buy some, look for a well-used, high-traffic
> battery rack and reach as far back in the rack as you can get so that you
> might get a later expiration date.
> 
> c) Don't buy more batteries than you'll need for about a year or so (if
> you're buying alkaline, lithium or silver-oxide batteries).
> 
> d) And most importantly: store your batteries in the fridge (NOT the
> freezer) if at all possible.  Otherwise store them in a relatively cool
> place in your house.
> 
> BTW, one of the worst battery 'features' that's come along in some time now
> is those built-in battery testers that you see in some of the name brands.
> These testers were useful when they first came out because they were only
> placed in the _packaging_.  Now some of them are putting one on every
> individual battery. Those things cause no end of trouble, because they can
> cause additional battery drain in storage even when they're not being
> activated.  I tend to steer clear of those manufacturers if at all possible.

How could this be, it is not a closed circuit and therefore cannot
affect the battery or its life. The natural drain of the battery would
remain the same.

Rona (a Physicist)

Insulin-Pumpers website http://www.bizsystems.com/Diabetes/
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