Hello there,
The video was pretty nice, i watched the whole thing.
When i first heard about this product i looked at the data sheets and found that if the device cuts out at about 1.3v then the 'new' product could provide about 300 percent of the normal run time, which is 200 percent more. But then after looking at other data such as internal resistance and most boost converters efficiency (it goes down for a lot of reasons) i had to bring that down to 200 percent total, which is only a 100 percent gain. That's at least something, but again, we cant forget, that is if the device cuts out at 1.3v. I dont think i have any devices that cut out that high, and if we allow that threshold to drop to 1.2v, then we dont get a real lot more out of it, if anything.
What i think they should do is buck up to the fact that they have a really dippy product, and instead of trying to pass it off as is, sell it as a battery booster that can boost an AA cell up to maybe 3 to 4 volts or maybe even 9v. At least then it might be worth something. But yes, then there is the all important question of just how much current can it really put out since it is so small. We'd have to actually test one to be sure. Small MOSFETs and small inductors can do a decent amount of current these days, but the package they are using is not just small, it's super small.
Another question i had was about the physical size. Just how much longer does it make the AA cell. If it's even a small amount longer it could actually ruin the original contacts of the device it is being used in, making it impossible to use with regular batteries after a time. It could even crack the plastic housing of an AA or double AA housing if it is that cheap styrene type, or warp other types of plastics.
This reminds me of the old Rayovac rechargeable alkalines. Anyone remember them? They only took a charge like 15 times when the claim was much much higher. But they did work in my TI programmable calculator because they had higher terminal voltage. That was the only thing they were good for however.