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Building a DIY 18650 charger, should I charge in series or parallel?

So, I have a balance charger (IMax B6AC) for RC batteries. I got a dual 18650 holder.
I wired it up for charging in parallel but I'm wondering if series would be the safer option as there's less chance of an cell damage if two cells are at different states of charge.
Let me know what you think.

Oh, I'll be including a 5A fuse in the finished product as I plan on using bananna plugs to connect to the charger.
 

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