I'm not planning on building a device like this but was curious what the electronics experts would have to say about it's feasibility.
The basic idea is to use cells with a much higher capacity (there are 18650s rated at 6,000+ mAh) while still allowing high-powered vaping. These cells aren't capable of delivering the current required for high power levels, but considering most vaping takes place 2-5 seconds at a time it seems like using a capacitor to drive the coil would allow you to maintain high power levels without pulling much current from the battery.
Seem like a reasonable idea? There is the obvious issue of charge-up time, and total watt hours available in the capacitor, but even roughly figuring out those details is beyond my knowledge. Then there is the issue of regulating the capacitor's output, which I suspect would be more difficult than regulating relatively consistent battery voltage.
The end-product would, roughly and in theory, be a device that lasts 3-4 times longer between charges, with the trade-off being a bit more bulk and having to wait 10 or so seconds between vapes.
Any feedback is welcome! As I said I have no plans to make anything but thought it was a pretty good idea assuming the technical details are workable. Do compact capacitors capable of ~15 amps at ~4v with a ~10 second charge time even exist (and at a reasonable price?) Is it possible to regulate capacitor voltage accurately enough for our purposes? I'm thinking the easiest would be for the device to have a fixed output voltage of 4 volts so that it would match a freshly-charged mech in performance, but again with a much longer run-time.
The basic idea is to use cells with a much higher capacity (there are 18650s rated at 6,000+ mAh) while still allowing high-powered vaping. These cells aren't capable of delivering the current required for high power levels, but considering most vaping takes place 2-5 seconds at a time it seems like using a capacitor to drive the coil would allow you to maintain high power levels without pulling much current from the battery.
Seem like a reasonable idea? There is the obvious issue of charge-up time, and total watt hours available in the capacitor, but even roughly figuring out those details is beyond my knowledge. Then there is the issue of regulating the capacitor's output, which I suspect would be more difficult than regulating relatively consistent battery voltage.
The end-product would, roughly and in theory, be a device that lasts 3-4 times longer between charges, with the trade-off being a bit more bulk and having to wait 10 or so seconds between vapes.
Any feedback is welcome! As I said I have no plans to make anything but thought it was a pretty good idea assuming the technical details are workable. Do compact capacitors capable of ~15 amps at ~4v with a ~10 second charge time even exist (and at a reasonable price?) Is it possible to regulate capacitor voltage accurately enough for our purposes? I'm thinking the easiest would be for the device to have a fixed output voltage of 4 volts so that it would match a freshly-charged mech in performance, but again with a much longer run-time.
(Like an arm hold a hand-weight building muscles). 
