I’m gonna try it and let you know! Either we’re both insane or great minds think alike, lets see.
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Don’t use a dual balance charger on a pack that is connected in series unless you WANT a sparkle show. I learned the hard way (duh)
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Loop key position?
Negative side before ESC. I’ve gone through enough charge cycles to know I must be doing something right lol
So how are you going to split the series connection before you charge, when it’s all wired up in your enclosure?
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Well that’s what I came here for 
I don’t do anything with these batteries until I get a bunch of feedback and general knowledge.
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Move Loop key to mid pack between the 6s packs? Is that an option? 
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This is what I did. I am wanting to make a thread with all what I’ve learned so far charging like this, just haven’t had too much time after my newborn son…
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This is critically important and a bit too easy to mess up. If you don’t disconnect the series, boom!
I’ve seen setups where there’s a mechanical lockout so you can’t plug in the charge port if th:series loop bey is still in place.
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Please do. Be keen for explanation / link to the bits in that setup - looks pretty robust
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Do you have a wiring diagram of this?
Maybe on a napkin somewhere, heh.
That one is basically two 5s packs joined by that big ol marine breaker switch. The 7 pin connector leaves one pin unused, as a 5s pack uses 6 connections (-all, +1, +2, +3, +4, +5). The charge and balance leads all run from those pins (for better or worse, lol).
The biggest advantage was having more space for batteries. I managed to squeeze in an extra P group in that enclosure. Charging is slightly less convenient, and I poofed a duo charger into a single by forgetting the hit the breaker switch. So far, no water intrusion and I realized that I haven’t taken the board apart since I installed the Benchwheel remote some 600 miles ago.
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I wonder if something could be done to make it impossible to forget the breaker switch.
Yeah, I was definitely trying to come up with a mechanical lockout, but by that time all my duo chargers we’re singles and it no longer mattered, haha. You can use two singles at a time no problem, even with the switch on (or at least I haven’t smoked another since). In any case I still mostly charge one side at a time now because I’m skurd
I’m going to try and make a wiring diagram that includes a mechanical lockout, maybe a shared loop key so only one can be connected at a time? I’ll be back with a sketch