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Piles-Caractéristiques (voir la source)
Version du 14 septembre 2014 à 14:07
, 14 septembre 2014 à 14:07Page créée avec « {{PILES-NAV}} == Les caractéristiques == {{bloc-etroit|tetx=Les caractéristiques sont ces valeurs que l'on peut mesurer et qui nous apprennent des choses utiles sur ces pi... »
{{PILES-NAV}}
== Les caractéristiques ==
{{bloc-etroit|tetx=Les caractéristiques sont ces valeurs que l'on peut mesurer et qui nous apprennent des choses utiles sur ces piles que nous avons justement en main.
There are a few different ways to 'measure' batteries, here are the ones I will be comparing
* '''Size'''<br />This is pretty straight forward, how big are the batteries? Lead acid batteries don't get much smaller than C-cell batteries. Coin cells don't get much larger than a quarter. There are also standard sizes, such as AA and 9V which may be desirable.
* '''Weight and power density'''<br />This is a performance issue: higher quality (and more expensive) batteries will have a higher power density. If weight is an important part of your project, you will want to go with a lighter, high-density battery. Often this is expressed in Watts-hours per Kilogram.
* '''Price'''<br />Price is pretty much proportional to power-density (you pay more for higher density) and proportional to power capacity (you pay more for more capacity). The more power you want in a smaller, lighter package the more you will have to pay.
* '''Voltage'''<br />The voltage of a battery cell is determined by the chemistry used inside. For example, all Alkaline cells are 1.5V, all lead-acid's are 2V, and lithiums are 3V. Batteries can be made of multiple cells, so for example, you'll rarely see a 2V lead-acid battery. Usually they are connected together inside to make a 6V, 12V or 24V battery. Likewise, most electronics use multiple alkalines to generate the voltage they need to run.<br />'''Don't forget that voltage is a 'nominal' measurement''', a "1.5V" AA battery actually starts out at 1.6V and then quickly drops down to 1.5 and then slowly drifts down to 1.0V at which point the battery is considered 'dead'.
* '''Re-usability'''<br />Some batteries are rechargable, usually they can be recharged 100's of times.
}}
{{PILES-TRAILER}}
== Les caractéristiques ==
{{bloc-etroit|tetx=Les caractéristiques sont ces valeurs que l'on peut mesurer et qui nous apprennent des choses utiles sur ces piles que nous avons justement en main.
There are a few different ways to 'measure' batteries, here are the ones I will be comparing
* '''Size'''<br />This is pretty straight forward, how big are the batteries? Lead acid batteries don't get much smaller than C-cell batteries. Coin cells don't get much larger than a quarter. There are also standard sizes, such as AA and 9V which may be desirable.
* '''Weight and power density'''<br />This is a performance issue: higher quality (and more expensive) batteries will have a higher power density. If weight is an important part of your project, you will want to go with a lighter, high-density battery. Often this is expressed in Watts-hours per Kilogram.
* '''Price'''<br />Price is pretty much proportional to power-density (you pay more for higher density) and proportional to power capacity (you pay more for more capacity). The more power you want in a smaller, lighter package the more you will have to pay.
* '''Voltage'''<br />The voltage of a battery cell is determined by the chemistry used inside. For example, all Alkaline cells are 1.5V, all lead-acid's are 2V, and lithiums are 3V. Batteries can be made of multiple cells, so for example, you'll rarely see a 2V lead-acid battery. Usually they are connected together inside to make a 6V, 12V or 24V battery. Likewise, most electronics use multiple alkalines to generate the voltage they need to run.<br />'''Don't forget that voltage is a 'nominal' measurement''', a "1.5V" AA battery actually starts out at 1.6V and then quickly drops down to 1.5 and then slowly drifts down to 1.0V at which point the battery is considered 'dead'.
* '''Re-usability'''<br />Some batteries are rechargable, usually they can be recharged 100's of times.
}}
{{PILES-TRAILER}}