How to use the 680B lipo charger to charge two 2S or 3S Lipo batteries at the same time.

For charging 2 2S Lipo packs at the same time you MUST follow the proper hookup sequence! You must also make sure both packs are very close to the same voltage as each other and that both batteries are the same capacity and C rating. You will need a "series" adapter to connect the two packs together. See the link below.
Series adapter

You will also need the extension board item # 680BE See Link below.
680B Extension Board

1. Connect the input leads to the power supply.

2. Connect the first Lipo to the port marked (B) for 2S packs or (C) for 3S packs. Connect the second pack to the port marked (B1) for 2S packs or (C1) for 3S packs.

3. Connect the two packs to a "series" adapter.

4. Make sure the output leads are disconnected from the charger and plug the series adapter into the output plug of the charge leads. DO NOT ALLOW THE TWO LEADS TO TOUCH EACH OTHER!

5. Plug the extension board wire harness into the 6S balance port of the charger

6. Plug the output leads into the charger positive(+) lead first and then the negative(-) lead.

Failure to follow this procedure exactly may cause damage to the charger and or the battery pack! Do not connect saddle style Lipo packs* in this manner! Damage to the charger and or Lipo battery WILL occur!

*Saddle style is any pack that has two seperate cases that are joined by a "jumper" wire between the two packs. See link below for an example.
Saddle Pack