right, it will work, it will just take a bit longer. Those 5400mah 3s packs need about 60w to charge at 1c. In theory, 1c charge rate will charge the batteries in one hour. In reality, 1c will take a bit longer, because the charger will ramp down the charge rate near the end of the cycle.
Also, keep an eye on the charger temps when you are charging both batteries at the charger's max. My PSD is 6a/50w per channel, and if I charged two 2s packs at 5.6a (1c for my packs) the charger would overheat. I had to back off the charge rate to 5a. That kept it from thermalling, but the charger still failed...
Also, keep an eye on the charger temps when you are charging both batteries at the charger's max. My PSD is 6a/50w per channel, and if I charged two 2s packs at 5.6a (1c for my packs) the charger would overheat. I had to back off the charge rate to 5a. That kept it from thermalling, but the charger still failed...