So, at 3.7 volts that is ...

7.4 Wh

WAIT WHAT

That'sa tiny battery

Wait, is that wrong?

Someone give specs please

apparently it's 1821mAH

I guess it is a couple of generations old, but even so

small battery, Apple

Okay, let's just round it up

Let's say you ned 10Wh

Let's see how much you would have to pedal.

Dang, I can't find how much energy that thing generates.

He has it in the video briefly.

https://newatlas.com/the-pedal-a-watt-stationary-bike-power-generator-create-energy-and-get-fit/13433/

?

Soemone says they can hand crank about 200W

hmm

https://michaelbluejay.com/electricity/bicyclepower.html

up to 200 W

I am not sure how quickly you can charge an iPhone battery.

Let's see

The iPhone can draw about 10W it seems

I will go try figure out how much would 1 energy credit be worth

10min with my quik math

Not sure tho

It would take an hour about to charge it then.

But is my theory possible?

Definitely

2000mah @ 3.7V is about 10Wh

You need to figure out what it can do and also what it's worth - they're slightly different

If it draws 10 watt, it would take an hour to charge from totally empty to full

That's not terrible

So, you can produce more, but you can't "squeeze" it into the battery faster than that

I mean, it's exercise 😛

I really should learn how to ride a bike

pedaling produces up to 200W, but you only need 10

can you store the rest?

So, you need to have patience, but you will not have to exert a lot of energy.

You can basically have a reclining bike, read a magazine, and if you lightly pedal, like the grannies at the gym, you can charge your phone, easily.

By this guy's estimates, you're doing worse in terms of cost and footprint