How about when you charge the battery using amps without volts you get back to me.
People actually do that, every single day.
Answer this one question --
Which uses more energy to recharge a battery from 50% SoC: Recharging at C/5 or recharging at C/20?
If you still don't get it, answer this one --
Which is more amp-hours in a battery: A 100% SoC battery charged at C/5, or a 100% SoC battery charged at C/20?
You only addressed one of my arguments. The rest is you re-living some argument that you had in the past that you just can't seem to get over.
Perhaps you should hunt that person down and discuss battery charge rates, charging inefficiencies, and whatever else it is you need so you can put that behind you. We know how batteries are charged and discharged and how they work so there is no reason to pretend anyone is arguing about it. No one is saying watt-hour counting is better at amp-hour counting than amp-hour counting. But neither can amp-hour counting replace watt-hour counting. They each serve a useful function in a battery management system.
Points in dispute are the accuracy of amp-hour counting alone and the importance of energy and power in battery applications. It also seems that you have recently presented the idea that you can exchange electrical energy using amps without volts.
In case you ever to decide to address just my arguments, I'll provide a current summary of my points so far:
1) Amp-hour counting and watt-hour counting both have to be supplemented to be accurate except for some specific conditions.
2) Energy storage capacity of a battery is important. The fact that we use watt-hour calculations for power loads supports that argument.
3) Both amp-hour and watt-hour operations provide useful functions.
4) Adding and subtracting battery energy can be and is done as part of some battery management systems.
5) Specific power is a function of battery chemistry and packaging.
As for the amps but no volts, we have one more point to cover:
We use the battery as an energy storage device and we exchange electrical energy and chemical energy. Since an electric current is not a flow of energy, you can't charge a battery using amps without also using volts. It was not done today or yesterday and it won't be done tomorrow.
The electrical energy flows to the battery in the electromagnetic field. The electric field and magnetic field are related to the voltage and current and it is the cross product of these fields that tells us the energy flow. Leave out one or the other and you have no exchange of electrical energy.
When charging or discharging a battery, we are moving charges between two points and that requires work (no super-conducting wire/battery stuff if you don't mind). The work per unit charge is the voltage difference. We measure the work needed by the potential difference. For our simple case, we can say voltage and potential are the same.
So, charging a battery using amps without volts has NOT been done every day: NEVER HAPPENED.