I tried Cap test in manual mode on the Vapcell S4 plus upgraded version (July 2020):
Slot 1: 10440 Vapcell 320mAh finished with 4.20V 330mAh
Slot 2: AAA LADA 900mAh finished with 1.53V 940mAh
Slot 3: EagleTac 18650 3400mAh finished with 4.20V 3196mA (9:45h)
Slot 4: EagleTac 18650 3400mAh finished with 3.12V 3191mAh (6:42h)
The 18650 in slot 4 finished the discharge step but it didn’t complete the final charge step. Maybe it was interrupted when I pulled the 10440 cell out of slot 1 when it had finished (alarm).
Cap test in auto mode #1:
Slot 1: 18650 GA 3500mAh finished with 4.20V 3468mAh (12:22h)
Slot 2: IMR18350 1200mAh finished with 3.33v 961mAh (2:33h)
Slot 3: IMR18350 1200mAh finished with 4.20V 975mAh (5:14h)
Slot 4: 18650 GA 3500mAh finished with 4.20V 3492mAh (12:5h)
The 18350 in slot 3 finished the discharge step but it didn’t complete the final charge step.
The 18650’s in slot 1 and 4 charged at around 1500mA initially, discharged at 500mA and then charged again at 500mA.
Cap test in auto mode #2 at night:
Slot 1: IMR18350 1200mAh finished with 4.20V 975mAh (3:35h)
Slot 2: 18650 30Q 3000mAh finished with 2.95V 2997mAh (6:25h)
Slot 3: 18650 30Q 3000mAh finished with 2.96V 2934mAh (6:34h)
Slot 4: IMR18350 1200mAh finished with 3.25V 1053mAh (2:25h)
The cells were all around 3.75V to start with. When they reached 4.20V, the charger didn’t seem to want to enter the discharge step. I pulled the power plug and plugged it back in 10 seconds later. Selected Cap test mode again. They started charging to 4.20V and each eventually reached 100%. Slot 1 and 4 started discharge first. A few hours later slot 2 and 4 had started discharge.
Slot 2, 3 and 4 stopped after the discharge step.
The room temperature changed from around 18 C to 10 C at night.
Cap test in auto mode #3 during the day:
Slot 1: 18650 GA 3500mAh finished with 4.20V 3476mAh (12:26h)
Slot 2: 18650 30Q 3000mAh finished with 2.68V 3010mAh (6:48h) 2.95V at 12:26h
Slot 3: 18650 GA 3500mAh finished with 2.82V 3442mAh (7:17h) 3.02V at 12:26h
Slot 4: 18650 30Q 3000mAh finished with 4.20V 3045mAh (10:33h)
Slot 2 and 3 stopped after the discharge step. They counted up to 100% when I pressed DISPLAY to switch to CH2 and CH3 at the end of the discharge step (alarm sounded).
Room temperature started at 15 C but gradually rose to 18 C after 6 hours. Discharge seemed faster in slot 1 and 4. Cell temperatures reached around 54 C.
Sometimes the voltage displayed while charging in Charge mode is 4.20V when it’s actually 4.07V when measured on a UT210E. Even though it might show 4.20V, it also displays >90% and keeps charging. If I take the cell out and put it back in, it then shows 4.07V and gradually goes up as it charges.
Overall, I’m happy with the charger. 
It’s fully charging my NiMH and Lithium cells. Discharge mode is awesome! I can finally put cells into storage without using a torch to drain a cell down to ~3.75V.