Why do certain battery types work well in some devices but badly in others?
battery April 4th, 2010Like for instance, standard alkaline batteries work badly in digital cameras. I would think a battery is a battery. Why is this??
Cameras need, for the flash, a battery that can deliver a high current for a brief period as the caps charge up for the next flash.
That means the battery has to have a low internal resistance, and not all batteries are good in this area.
There are not many other distinguishing features of batteries. The only ones that come to mind is the ability to hold charge for a long period, or the ability to hold a lot of energy.
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April 4th, 2010 at 2:55 pm
Cameras need, for the flash, a battery that can deliver a high current for a brief period as the caps charge up for the next flash.
That means the battery has to have a low internal resistance, and not all batteries are good in this area.
There are not many other distinguishing features of batteries. The only ones that come to mind is the ability to hold charge for a long period, or the ability to hold a lot of energy.
.
References :
April 4th, 2010 at 3:08 pm
Fundamentally, it’s down to ‘internal resistance’.
Alkaline cells tend to have a higher internal resistance (so are poor at supplying large amounts of power in a short time; the sort of thing you need to write to a memory card or charge the flash gun).
Rechargeable cell’s tend to have a low internal resistance when compared to alkaline cells, so are better at supplying the high powers needed over short times.
Alkaline cells will often have a higher energy density, so actually contain more total power.
References :