1S packs don't have balance ports but the main outputs are also wired to the balance port on cell 1. I've attached a pic of how it looks (thanks to MC).
The theory is that the balance port reads the battery voltage whilst charging more accurately as it would on a 2S, and it's not confused by the current flowing down the main leads and the voltage drop across the main leads etc. You can see this if you put a DVM on the battery while charging and it will show different from that the charger is showing on it's display.
I'm aware of chargers that can do it this way, but don't know which. Anyone doing it and can you post which charger model you have?
TIA
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Atom GT12 & Cougar KD Racer
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