Hi group,

Here is another Kickstarter project with technical challenges:

https://www.kickstarter.com/projects/shawnpwest/30-second-charging-rechargeable-batteryIn the FAQ the stated capacity is 1150 mAh.

So we have 1.5V x 1.15A x 60 x 60 (conversion to seconds) = 6210 Joules.

These Lithium Ion super caps:

http://ca.mouser.com/new/Taiyo-Yuden/taiyo-yuden-lithium-ion-capacitors/in the package that is close to fitting an AA battery (12.5mm diameter x 35 mm) is 40F

Charge these to 3.8V we have:

1/2 CV

^{2} = 0.5 x 40 x 3.8

^{2} = 288J

If you allow for the fact you can discharge to 1/2 the maximum voltage, you can extract 3/4 of the energy:

288 x 0.75 = 216 Joules

We only have 1/30 of the energy required

**Charging **If the rechargeable battery had a useable capacity of 6000 Joules, we would need 8000 Joules.

8000J / 0.5 x 3.8 x 3.8 = 1100F

We would need 1100 Farads.

I = C dv/dt

= 1100F x 2V /30s = 73 Amps

I detect a few problems

Regards,

Jay_Diddy_B