Figure 3 shows the typical V-I waveforms obtained while simulating the charging of a Li+ battery up to 4.2V. Two test runs are shown: one with an initial fast-charge current of 1A (traces B and D), and one with a fast-charge current of 2A (traces A and C). In both cases, the CC phase continues until the termination voltage reaches 4.2V. After that point, current decays exponentially while the simulated battery voltage remains constant. The shorter time to termination for the 2A run is just what you would expect after doubling the charging current for a real battery. Notice, however, that doubling the current does not halve the total charge time; it only halves the time required to reach CV mode, as is the case with a real battery.