SecretSquirrel wrote:Rating the in Wh isn't helpful as it makes determining the characteristics of the battery.
Looking for Knowledge wrote:When drunk.....
I want to have sex, but find I am more likely to be shot down than when I am sober.
Since you cannot just randomly swap in different voltages, why do you as an end user "really just care about the energy density of a battery." Situations where you, as an end-user, can make a meaningful choice based on that criteria are pretty rare.ztrand wrote:Yeah i know you cant change batterie voltages villy-nilly in an existing circuit, I guess my original question came about because as an end-user i really just care about the energy density of a battery.
FireGryphon wrote:This thread made me realize how different the battery market is from every other consumer market. In most consumer markets, things are simplified to the point where there's almost nothing to decide. With batteries, on the other hand, consumers are still tasked with finding a battery with a certain voltage and energy capacity as opposed to just finding a battery with a certain density. This is, of course, unavoidable given the facts about electricity.
Since you cannot just randomly swap in different voltages, why do you as an end user "really just care about the energy density of a battery." Situations where you, as an end-user, can make a meaningful choice based on that criteria are pretty rare.
Wintermane wrote:Ok ill explain. The voltage isnt up to you its up to the designer of the gizmo ONLY the ah is up to you so thats all they care about talking about.
Wintermane wrote:Ok I assume your MAKING something? What is it your making?
ztrand wrote:Wintermane wrote:Ok I assume your MAKING something? What is it your making?
Just tinkering with home-built and home-programmed robots. Small ones (this is not really why i asked the original question, i was just curious)
One can always modify the voltage using various regulators, thus the main issue when choosing batteries is total energy stored.
SecretSquirrel wrote:When thinking about this, consider that with a linear regulator (the kind most common on a small robot), it's the amps that matter. With a linear regulator, if I pull 1/2Ah from a 6V battery, I will still pull 1/2A from a 12V battery. If the 6V battery is 6Ah and the 12V is 3Ah, they will be physically that same size (give or take) and the 12V battery will last half as long. The extra 3W is dissipated as heat in the linear regulator.
In looking for very good batteries I suggest you look at flashlight fanatics websites and where they get thier batteries
just brew it! wrote:RC airplane enthusiast sites would also be a good place to look. Size and power density matter a lot when you're trying to get something up in the air...
ChronoReverse wrote:AH is terrible because nobody states even the nominal voltage of the battery when mentioning the AH capacity. The latest phones have recently transitioned to 3.8V batteries (as opposed to 3.7V) and that already makes a noticeable difference.
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