How is the battery life consumed by heavy consumption during charging?

Question

Mobile devices

Let's say there is a 4Ah battery, a 2Ah charger, and an application that consumes 1.9Ah.
The battery is now 1% charged The
charge will be up to 100% and will take 39 hours (0.1A per hour based on the condition) Will the waste of
battery life be equal to one charge cycle or more than one charge cycle?

Answer 1

1 cycle in greenhouse conditions

Answer 2

You confused red with warm and tried to drag us into it.
Battery capacity - that's right, ampere-hours (it is able to provide such and such a current for such and such a time).
Charge current - amperes (without any hours). Discharge current, i.e. loads too.
The application is software, it does not consume anything itself. But it can cause the iron to draw current, and this current will depend on the operating conditions. So your 1.9 amps (without clock) is just an assumption based on nothing. The device itself does not measure the current, it is only able to measure the voltage of the battery, and it predicts the capacity (remaining charge) rather inaccurately. However, I can be wrong if the latest devices began to supply a specific current sensor, and this sensor is available to the user (this was not the case before).
Now to your case. That simple arithmetic that you gave in the question is not good - firstly, because of the unknown current (where did you get the data about 1.9 Ah ?), and secondly, the battery life is a very slippery thing, it depends on many factors (perhaps that is why now almost no one is concerned with counting cycles - and earlier they tried to reset the cycle counters built into the controller). If you want to extend the resource, act from general considerations: do not bring it to a full charge and a full discharge (somewhere I saw this assessment: if you operate a Li-battery between 20% and 80% of the charge, without bringing it to the maximum / minimum, then instead of 1000 cycles she serves 5000,and I don’t know how reliable this is), do not allow it to heat up excessively, try not to use the accelerated charging mode. The only case when this mode is justified is when you (as in your question) really need to run a "heavy" application at the same time as charging. But in this case, one can only guess about the charging time - the option is not ruled out that this time can go to ∞ if the charger is weak and the current is high. Naturally, it makes no sense to talk about counting the number of cycles in this case.