Each charing channel is independent.So there is not any worry about the voltage variance battween your batteries.
This charger has low voltage protection(3.6V/cell safe ended voltage).That is to protect your input power (2S-6S)battery,
avoiding over discharged as the input power.

Item: 6 Ports 1S Battery Charger
Support Battery： 1S 4.20V/3.7V Lipo and 4.35V/3.8V Lihv.
Input connector: 12V/2A DC55*25 or XT60
Input voltage range: 7V--27V(2S-6S)
Max charging current: 0.4A (Single-port)
Support battery connector: BT2.0&PH2.0
Battery Type：LiHV 4.35V and Lipo 4.20V
Low input voltage protection: 3.6V/cell safe ended voltage (if you use 2S-6S battery as the input power).
Dimensions：85*55*20mm
Use Steps:
1. Power the charger with 12V power adapter or 2S--6S battery,then it dispays "-3p" first,then shows the input voltage.
2. Set up the battery type switch , Lihv or Lipo type per your battery.
3. Press the button to set up the 3 Digital LED display to match your input power type.
This step is activating low votlage protection,avoiding your input power battery to be discharged over.
Ended voltage: 3.6V/ cell.So the discharge protection voltage as below

12/2A Adapter input-------"-dc",
2S battery input-------"-2P", ended 7.2V
3S battery input-------"-3P", ended 10.8V
4S battery input-------"-4P", ended 14.4V
5S battery input-------"-5P", ended 18V
6S battery input-------"-6P", ended 21.6V

4.when the display is showed the right input,just wait 3 seconds without any action,the setting is done.
Then the charger displays the input voltage solid.
5. All the 6 LEDs are fashing. Then you can plug in your batteries,the This channel starts charging auto.
Please DON'T use the BT2.0 and Ph2.0 at the same channel at the same time.

Charging Status:
Stand by without Battery plugged in: Green Flash
Charging: Green Solid
Charge Finished: Green Off

If you need to adjust the input type during charging,just press the button to change it again.

Package:
1 * 6 Ports 1S Battery Charger
1 * US 12V Adapter（AC 110V-240V）