You actually only have 5000mah capacity in your batteries, bet setting the charger higher doesn't hurt anything. Series charging adds the voltages together, parallel charging adds capacities. So you are actually trying to charge at 2c, I don't know if that charger has the power to actually go to 10A at 12s, the 615i Duo 3 I have can't. The Duo 3+ almost can, the newest 720i Super Duo 3 can. Check the actual charging current while charging and see what the charger is actually doing.
Mike
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