Most of the math looks right, but the units . . .
Capacity is in mAh or Ah . . . how many amps you can pull continuously for an hour.
Your Max Charge and Max Discharge should be Max Charge Rate and Max Discharge Rate. Pedantic, I know, but as long as you understand those differences, the labels are just text.
Your charge time . . . well that's off. A typical charger will:
- start at a "constant current", feathering the set voltage to dump the set current into the battery.
- when it nears the max set voltage it will switch to a "constant voltage", feathering the current to keep the voltage at the max set point
- Smarter chargers will declares itself "done" When the battery draws below a minimum current. Dumber chargers will just let continue to charge (usually giving it a burst of current when the voltage drops far enough, and stopping when the the voltage rises to the set point again).
Complexity goes up a bit when you're balance charging (charging each cell individually, simultaneously), but that strategy is fundamentally the same.
The problem of prediction has two issues -- Variation in the chargers and in the batteries.
While the general strategy is the same for the chemestry, the way a charger decides when to switch between the two modes, how it approaches balanced charging and when it declares "done" has a lot of wiggle room for the charger's designer, and can dramatically affect the charging time.
The battery health will also dramatically affect the charging time as well, especially with balance charging -- if you've got a weak but still functional cell it can dramatically increase the charge cycle.
Running some notional numbers, everything but that last block checks out. The last block pops out with a 1C rate taking less than an hour -- it's my experience a good balance charger at a 1C, even with 20% left on the pack, will *still* take over an hour slowly bringing each cell up to full charge. An old, weak pack might take over two (but those, I seldom used for flying).
