why does it take so long to charge a battery?

[Hellotalkie]

I was just wondering, my laptop takes 4 5 hours to charge, normal I know but i never knew what takes so long. Over charging protection? Could batteries charge faster without it?

 

[Jeff7]

Slower charging is less stressful on batteries. Li-ion batteries are especially sensitive to improper charging, and MUST be used with a properly-designed charger, such as one which prevents overcharging, or else you can have lots of fun problems, like bursting cells or a small fire.
Li-ion batteries (battery = multiple cells wired together) have charging circuitry that keeps an eye on each cell to ensure that none are overcharged; it also ensures that no one cell drops too low during the discharge phase. The entire battery is only as good as its weakest cell.

NiMH cells can take a fairly rapid charge; some chargers out there will try to do a full charge in just 15 minutes, but I'd imagine that this would make the battery quite hot, and deplete its overall lifespan.
A slower charge is much gentler, and it also allows the battery to attain a more complete state of charge.

 

[Baked]

Buy an extra battery.

 

[Barfo]

Originally posted by: Baked
Buy an extra battery.

 

[Newbian]

Well if you placed the unused vibrator back into the charger when you were done with it the battery would be ready the next time you need it.

 

[Jeff7]

Originally posted by: Newbian
Well if you placed the unused vibrator back into the charger when you were done with it the battery would be ready the next time you need it.

Dammit, I think I need help.


The combination of a battery thread and mention of a vibrator got me thinking.....
If they could implement piezoelectric or inductive circuitry into the vibrator, which would also incorporate charging circuitry, they could use vaginal contractions as a sort of regenerative charging system, kind of like regenerative brakes, to prolong battery life. And if the vibrator is moved in and out with adequate speed, an inductive charger, like the ones used in shaker flashlights, could also be used - and it would probably be able to sustain the batteries for a very long time, though I think they would eventually require an external charger.
Battery life would of course depend on a variety of factors though, specifically on how it is used.


In an unrelated matter, people say I think about things too much.

 

[Newbian]

Jeff...seek help asap.

 

[jlee]

Check this out.

 

[lxskllr]

Originally posted by: JLee
Check this out.

:^O

Expensive. Looks like a nice light though. Do you use that?

 

[jlee]

Originally posted by: lxskllr

Originally posted by: JLee
Check this out.

:^O

Expensive. Looks like a nice light though. Do you use that?

Nope - they're just coming out. I might get one eventually...we use these and these. I keep a Streamlight Strion in my car or truck (I have an older model light - not the one pictured).

 

[lxskllr]

Originally posted by: JLee

Nope - they're just coming out. I might get one eventually...we use these and these. I keep a Streamlight Strion in my car or truck (I have an older model light - not the one pictured).

Ya know, looking over the specs, it's probably worth it for someone that uses a flashlight on a professional basis. Maglights, and other standard tech lights are a PITA to keep and maintain. The UC3.400 should last most, if not all of your career if it lives up to the documentation.

 

[Auggie]

The charging takes a long time because of the chemistry of the battery. The reason you get juice from a battery in the first place is a controlled chemical reaction to produce electrical potential. By plugging in a rechargable battery, you're essentially pushing it back up the hill, from a thermodynamic perspective.

 

[Jeff7]

Originally posted by: Auggie
The charging takes a long time because of the chemistry of the battery. The reason you get juice from a battery in the first place is a controlled chemical reaction to produce electrical potential. By plugging in a rechargable battery, you're essentially pushing it back up the hill, from a thermodynamic perspective.

Sisyphus would be proud.

Originally posted by: Newbian
Jeff...seek help asap.

Perhaps I could create some sort of albino shouting gorilla...

 

[sao123]

Originally posted by: JLee
Check this out.

i want one NOW!

 

[Tiamat]

depends on the cell chemistry and the cell balancing circuitry that prevents overdischarge and overcharge.

 

[PlasmaBomb]

Originally posted by: Jeff7

Originally posted by: Newbian
Well if you placed the unused vibrator back into the charger when you were done with it the battery would be ready the next time you need it.

Dammit, I think I need help.


The combination of a battery thread and mention of a vibrator got me thinking.....
If they could implement piezoelectric or inductive circuitry into the vibrator, which would also incorporate charging circuitry, they could use vaginal contractions as a sort of regenerative charging system, kind of like regenerative brakes, to prolong battery life. And if the vibrator is moved in and out with adequate speed, an inductive charger, like the ones used in shaker flashlights, could also be used - and it would probably be able to sustain the batteries for a very long time, though I think they would eventually require an external charger.
Battery life would of course depend on a variety of factors though, specifically on how it is used.


In an unrelated matter, people say I think about things too much.

You know fine rightly the piezoelectric effect would be inefficient.

An inductive charger will probably be inefficient too, at least the one on my torch doesn't work produce much power at slow speeds. So unless the woman is going at it like a jackhammer...

 

[Rubycon]

Originally posted by: PlasmaBomb

You know fine rightly the piezoelectric effect would be inefficient.

An inductive charger will probably be inefficient too, at least the one on my torch doesn't work produce much power at slow speeds. So unless the woman is going at it like a jackhammer...

Law of conservation fellas....

Also a dynamo produces physical resistance proportionate to the electrical load on its output terminals. It would be like trying to take off with the hand brake on.

Piezoelectric generation produces feeble currents at sufficiently high voltages to fire a NE2 glow lamp with ease. This can be witnessed by playing with a Rochelle salt crystal microphone element found in the common Astatic D104 radio mic used by CB/Amatuer radio operators.

In any case if such a current was used as a tickler in a sensitive area...hmmm you may be on to something there! :evil:

 

[Jeff7]

Originally posted by: Rubycon
Law of conservation fellas....

Also a dynamo produces physical resistance proportionate to the electrical load on its output terminals. It would be like trying to take off with the hand brake on.

Surely you mean, "get off with the hand brake on". :laugh:

Piezoelectric generation produces feeble currents at sufficiently high voltages to fire a NE2 glow lamp with ease. This can be witnessed by playing with a Rochelle salt crystal microphone element found in the common Astatic D104 radio mic used by CB/Amatuer radio operators.

Right. Common. Yes. <shifty eyes>

In any case if such a current was used as a tickler in a sensitive area...hmmm you may be on to something there! :evil:

Yeah, just watch, someone somewhere is going to make a lot of money because he/she decided to build a prototype and go to market.

 

[sao123]

Originally posted by: Jeff7

Originally posted by: Newbian
Well if you placed the unused vibrator back into the charger when you were done with it the battery would be ready the next time you need it.

Dammit, I think I need help.


The combination of a battery thread and mention of a vibrator got me thinking.....
If they could implement piezoelectric or inductive circuitry into the vibrator, which would also incorporate charging circuitry, they could use vaginal contractions as a sort of regenerative charging system, kind of like regenerative brakes, to prolong battery life. And if the vibrator is moved in and out with adequate speed, an inductive charger, like the ones used in shaker flashlights, could also be used - and it would probably be able to sustain the batteries for a very long time, though I think they would eventually require an external charger.
Battery life would of course depend on a variety of factors though, specifically on how it is used.


In an unrelated matter, people say I think about things too much.

you might need to explain this a little further... my EE is a little weak.

 

[Jeff7]

Originally posted by: sao123
you might need to explain this a little further... my EE is a little weak.

Piezoelectric materials produce a voltage when pressure is exerted on them.
Inductive - move a material through a magnetic field, and the electrons will want to move. If it's a conductor, you'll get a current flow.




OP: You should consider changing your username to CR2450.

 

[Kelvrick]

Originally posted by: Jeff7

Originally posted by: sao123
you might need to explain this a little further... my EE is a little weak.

Piezoelectric materials produce a voltage when pressure is exerted on them.
Inductive - move a material through a magnetic field, and the electrons will want to move. If it's a conductor, you'll get a current flow.




OP: You should consider changing your username to CR2450.

I wonder if you could also using the produced electrical current to create an extra bit of "shocking" stimulation as well...

 

[Jeff7]

Originally posted by: Kelvrick
I wonder if you could also using the produced electrical current to create an extra bit of "shocking" stimulation as well...

This sounds familiar....

Originally posted by: Rubycon
In any case if such a current was used as a tickler in a sensitive area...hmmm you may be on to something there! :evil:

*sigh*

Dammit, I just know I'll regret this when I see something like this on the market, like the JackRabbit-StimVolt or something like that.

Hell, maybe it'd make a good Kegel exerciser or something like that - more pressure on it means more voltage. :laugh:


I need R&D money and some product testers now.

 

[Nik]

The electronic charge is ready to charge the battery very quickly, as you observe, but the electrochemical battery is not ready to accept all of these charges. What you have is a bunch of positive charges on one side of a container of liquid, and a bunch of negative charges on the other side. Each side has its' own chemical reaction, converting neutral molecules to ions with the added electrical energy. But in order for ALL the molecules in the liquid to be ionized, you have to wait some time for the random (brownian) motion and ionic (electromagnetic force induced) motion (leading to collisions of ions and molecules) of the liquid in the battery to move all the neutral molecules to one side or the other.

In other words, the electric part is ready to charge quickly, but the charging electrochemical reaction takes some time to complete. But realistically, many rechargable batterys can be charged in about 15 minutes. The reason that they take longer is that the AC-DC (AC at the wall outlet, DC at the battery) conversion is required to be efficient and cheap. As such, there is very little power output to the batteries (constant voltage per battery, small amount of current per battery). Incidentally, when AC-DC has to be cheap and efficient it has to also be low power/current for constant DC voltage. Since there are fewer charges available on each side of the electrolyte (fluid), the brownian/electromagnetic motion takes longer to charge all of the molecules (often a couple hours).

 

[Tiamat]

Originally posted by: Jeff7

Originally posted by: Kelvrick
I wonder if you could also using the produced electrical current to create an extra bit of "shocking" stimulation as well...

This sounds familiar....

Originally posted by: Rubycon
In any case if such a current was used as a tickler in a sensitive area...hmmm you may be on to something there! :evil:

*sigh*

Dammit, I just know I'll regret this when I see something like this on the market, like the JackRabbit-StimVolt or something like that.

Hell, maybe it'd make a good Kegel exerciser or something like that - more pressure on it means more voltage. :laugh:


I need R&D money and some product testers now.

Well, back in the 1980's: US 4616640

 

[Jeff7]

Originally posted by: Tiamat
Well, back in the 1980's: US 4616640

So is "electric vagina" now in your search history?