It sounds like charger A is running true CC-CV charge mode which I am told is correct for lipo .... certainly what my charger does.
I've not had any swelling on the 2 packs I've used for 18 months but they don't balance any more ... ok they do but take about 2 hours to do so after reaching 8.4V so can no longer balance charge at the track. I used to balance every charge until I couldn't anymore.
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