Compared to a common lithium battery they are very poor energy storage devices. About 1/50 the capacity of that of an equally sized lithium battery which would give you a run time of around 2 - 5 minutes between charges.

Yes, it was an idea but it was a poorly researched one.

Well, but I am not looking for a lot of energy, I am just looking for something that I could charge quickly and give a modest amount of juice to my cellphone. Imagine, if I could charge the bank in 1 minute and then get about 20% extra battery, it would be good

 

http://www.ebay.co.uk/itm/MT3608-2A...501671?hash=item1eb6e554e7:g:LSoAAOSw9NdXvHj9
"An adjustable DC-DC converter for step applications. Basically, input voltage needs to be greater than 2V DC for an adjustable output of intput voltage to 28V DC. EG powering a 5v arduino via 2 x AA cells."

would it be possible to design a type of joule thief circui, something that would be able to take advantage of the amount of current the capacitors can supply to boost a lower voltage to 5v

 

Well, but I am not looking for a lot of energy, I am just looking for something that I could charge quickly and give a modest amount of juice to my cellphone. Imagine, if I could charge the bank in 1 minute and then get about 20% extra battery, it would be good

Yes it would be good until you do the math on the physical dimensions, cost to build and power input to do such.

 

How many cubic inches for that capacitor bank?

ak

 

How many cubic inches for that capacitor bank?

ak

There is not really limit, something like 20cm x 20cm x 15cm something like that

 

Just for comparison:

A 500F 2.7V capacitor has 1,827 Joules when fully charged.
A 1.2V 2500mAH AA cell has 10,800 Joules when fully charged.
A 5V 10000mAH power bank has 180,000 Joules when fully charged.

Sorry, but I would rather carry my power bank than a bank of 100 500F capacitors in my pocket.

Bob

 

What is the self discharge rate for your supercaps?
Unless you have charged them VERY recently (like mere hours before using) there will be less charge in them than your calculations say.

 

What is the self discharge rate for your supercaps?
Unless you have charged them VERY recently (like mere hours before using) there will be less charge in them than your calculations say.

the use I intend for it, is imagine I have to leave my house in and my phone is almost out of battery, I am looking for something that I could charge really quickly and that will give me the extra juice to make it back home with the phone not dead. So I would charge the bank, and immediately start using the charge to charge my phone

 

Yes, but

Just for comparison:

A 500F 2.7V capacitor has 1,827 Joules when fully charged.
A 1.2V 2500mAH AA cell has 10,800 Joules when fully charged.
A 5V 10000mAH power bank has 180,000 Joules when fully charged.

Sorry, but I would rather carry my power bank than a bank of 100 500F capacitors in my pocket.

Bob

Yes you are totally right, but the thing is that an AA cell is not rechargeable and the one that are take forever to recharge. And the same for the powerbank, I have a 8000mah powerbank, it gives me a couple of charges, but it takes for ever to charge, I want something that I can charge in a couple of minutes, that can give a the extra juice I need until I can put my phone down to charge.

 

Can anyone help me?

You can easily help yourself by doing some basic math. Like how much energy is needed to charge up your phone and how many of those little super caps are needed to deliver that much energy. You may be surprised by the answer.

 

Yes, but

Yes you are totally right, but the thing is that an AA cell is not rechargeable and the one that are take forever to recharge. And the same for the powerbank, I have a 8000mah powerbank, it gives me a couple of charges, but it takes for ever to charge, I want something that I can charge in a couple of minutes, that can give a the extra juice I need until I can put my phone down to charge.

So this is all based on poor planing on your part regarding keeping your necessary gear properly charged as it need to be.

I don't see the relevance of having a bulkie limited capacity power pack that charges in a minute only to then take 20 minutes for it to transfer that charge to the actual phone when a battery based power pack can supply far more energy in less volume and multiple units can be set up to always have one or more charged up and ready to go at any time if you did the least bit of forward planing at any point in time.

As for battery charge time I know many RC vehicle hobbyists use high capacity batteries they rapid charge in mere minutes so obviously the battery tech to do such recharging processes is out there and widely used.

 

I am looking for something that I could charge really quickly and that will give me the extra juice to make it back home with the phone not dead.

You cannot make your phone charge faster than the rate for which it was designed. It has an internal charge regulator that determines the max charge rate.

You're barking up a tree that ain't there.