What about what I said is false? Are you saying a healthy cell and an unhealthy cell can be wired into the same pack and their voltage will remain the same after the voltage has been "equalized"?
I quoted the false statements in my reply in post #7. Namely, it is impossible for only
some cells in a parallel pack to be overcharged (or overdischarged). When connected in parallel they will always be at the same voltage (with current or not).
Note that in parallel their effective charge termination current will be altered based on current distribution, but this is often a good thing (e.g. it permits high IR cells to get a fuller charge). Such paralleling is often used to trick the charger into using a lower termination current when it lacks such an option.
I won't go into specifics of what's happening when you have 2 cells of uneven capability/charge state/cell health both running together, but for as long as it can hold up, most of the voltage and wattage comes from the healthy cell. It will be heavily taxed.
Again, of course the load will be distributed based on the resistances. But you can calculate the numbers and design accordingly to ensure that no cell is overloaded.
But note that the OP asks about parallel
charging. This is perfectly safe and is done all the time by RC vehicle hobbyists to shorten charge times - even with quite dissimilar packs (having equal charge termination voltage of course). Search any RC hobby forum on this topic and you will find many posts describing how to parallel charge packs, and even graphs illustrating what happens in parallel.
I suspect some of the confusion above stems from warnings about cells in
serial (vs. parallel), where some of the above concerns do apply.
Note: in fact the charge termination voltages don't need to be equal, but you need to stop the charge at the lowest one. For example you could charge a 4.20V and 4.35V cell in parallel, stopping at 4.20V. But then you'd need to do a final (short) charge on the 4.35V cell to finish it. This is generally much quicker than charging both separately. I often do things like that to save time.