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what is a capacitor battery/battery capacitor? Answered

what are batt-caps, how do they work, and how would 1 be wired to a 1.5v battery? what are some specific names of different batt-caps?


So far the most promising supercap for a battery is the lithium ion cap...

It is safer than a lithium ion battery on thermo runaway,more power density than the than lithium ion battery,and and can last 20 years in electric car service instead of 2 years like the lithium ion battery.

The hybrid stuff is old school ohms law and surge control..IE you a motor and/or

a magnetic inductance furnace at a steel mill.(both will surge up to 10 times normal working current on startup)So either the light company or electrician installs cap in parallel making volt fixed current floating between the load and the capacitor.

That is also the reason you see them at substations distribution points for power companies.So that instead of the browning out the cap surges ahead to hold that voltage.

Many folks that work with old school capacitors with not understand chemical supercaps energy density among other things.


6 years ago

You ask a good valid question.  It's certainly easy to get a capacitor with enough charge and voltage to equal the target battery capacity times ten.

Lets consider the battery, when you first apply the cap there will be a very high current ( damaging to the bat ) the impedance of the cap is essentially nil when compared to the battery resistance.
If the battery survived the initial extreme current . 
Now it's later and the cap voltage is just above the battery,  as the bat chemical voltage has raised and the cap voltage has lowered by discharging.  A few seconds has elapsed and a delicate balance begins as battery and cap voltage equalize.  
This charging method didn't work and if fraught with dangerous hazards.

You can understand batteries prefer to be charged at a fraction of their capable delivery. Different batteries have specific charge profile requirements.

As a first approach, I would build several identical caps in series up to
about 30V when charged, them use an LM217 regulator in constant current control mode to charge the battery slowly.


would placing a resistor aid in minimizing the damage to the battery?
what is an LM217?
you are correct in that i have little knowledge with electrical circuits, but i desire to learn the most i can for desired results and the more help i can get the better.

Sorry LM317... 
Yes a resistor will protect the battery but it will waste energy.
Here is a circuit for you to think about.  .  .   A

it looks like it could work, though if there were a simpler method that allowed for the battery to be the source of power and kept the battery charged at the same time then that is preferable.
From what I've read, cold electricity is induced via pulses (the faster the better so to speak) a pulse pause sort of thing, several times a second.
I assume the LM317 manipulates the power by helping it to flow smoothly. lots of tiny caps.
Would several resistors in parallel work to allow a smooth flow?
I read via electronics.howstuffworks.com/capacitor2.htm a single farad is the same as a coulomb and 1 second of ampere power, so wouldn't a cap that is smaller then the 220F be more suitable? something that charges quickly and discharges slowly enough to not cause much harm to a battery.

I have purchased all the components for a Joule Thief, but instead of a simple resistor I purchased a variable resistor and have been unable to figure out how to wire it in to make the circuit work. plus the transistor has no markings for the pins.

There are hundreds of transistors, if you and a higher power know what you bought, How do you suppose I would know which transistor or which
JT.   Same goes for the resistor.

Have nice holiday.   .   .   A

oh, sorry. the parts are for a very basic and simple JT like that on youtube (how to make a joule thief). except the resistor is a 1k variable and the toroid is a small pvc cut off. about 1/4'' and another about 2 - 2 1/2'' diameter. I managed to gain some help on the resistor, but the JT is not having the effect it is supposed to. it takes 3 volts to make it work and i found out that the power is not even flowing through the resistor like it should. I am at a loss.


6 years ago

A battery capacitor supplier sells low impedance condensers to improve delivery of hot or cold electric current to downstream electronics.

Super or ultra capacitors can be charged and supply electrical power with No Battery Involved.  I have a client who manufactures a service LED flashlight that charges in less then a minute and lights continuously for five hours at full light output from over 3 months standby.  Repeat  cycles are rated above the switch MTBF.

Put your capacitor in parallel with your 1.5v battery.

There are many,  perhaps you know how to look up specific names ?


What is MTBF? I desire a batcap that is as low as 1.5 + volts.

The electronic term MTBF ( Mean Time Before Failure ) for a switch is in the
millions of operations before it won't function as designed.  Every PCB and individual component selected for military, medical and spaceflight has been tested for MTBF.  These same sectors are not forced to use un-leaded solder because it would not do to have electronics fail prematurely in a flying war missile or in a hospital fusion pump or in a space capsule attitude control because of a sudden metallic solder separation.

So if you discover a wonderful new technology you will be forced to use a failure pron lead-free solder in your
Mouser has a 220Farad ( not uF ) 2.3Volt  Super-cap for $26..


will that kind of cap have the capability of recharging a small battery?