If you configure them in parallel, they can all charge at the same time. Increasing the number of cells doesn't increase the time to charge them.
Correct. In principle if you have enough current available you can charge several thousand 18650 cells in the same time it takes to charge one. But you also need low-loss switching to reconfigure all the batteries to be parallel and monitor them all for rate of charge, voltage, and temperature. The electronics needed are buildable but not trivial.
Comments
Correct. In principle if you have enough current available you can charge several thousand 18650 cells in the same time it takes to charge one. But you also need low-loss switching to reconfigure all the batteries to be parallel and monitor them all for rate of charge, voltage, and temperature. The electronics needed are buildable but not trivial.