Originally Posted by flarssen
Parallel charging is quite common today, but some caution is needed. I connect the packs one at a time first, and check the state of charge with the charger in monitor mode, before connecting them all in parallel.
Such at unit has some other advantages. It can be used to charge packs with built in regulators, where only the balancing connector can be used for charging. For a RX pack there is no need to disconnect the pack from the switch, etc.
You take the risk !
I charge in parallel only if I am sure both packs are exactly at the same level i.e. they are built together like my 12s2p a123 packs (four 6s1p packs coupled together).
Key argument for iCharger is fast charging, not "many" charging.