How to use the 1s/2s switch:
Plug the switch inline with your balance lead on the charger side. Plug in your 1s or 2s battery and select the corresponding cell count on the switch. Make sure the switch is on the proper cell count prior to charging/discharging, do not switch cell counts while charging.
If you select the 1s/2s switch and the 7 pin upgrade, the 7 pin upgrade will ONLY be applied to the switch.