Max A, is maximum amperage the motor can take. No Poseidon's chart doesn't specify max amps but you can very easily figure it out. Amps multiplied by Volts equals Watts, and since the Max watts is listed as well as the max volts you can figure out max amps.
As for your batteries, you're talking about the most basic of principles here. The 5000mah pack will be able to supply more amperage and sustain less voltage drop under load meaning more power. In my opinion, a high amp draw 1/5 setup like this should have batteries capable of 150amp sustained draw. You didn't mention the C rating of your packs but the 3400mah pack would need to be at least 45C and the 5000mah at least 30c to be able to put out 150amps. That's my personal opinion on what should be the minimum to keep everything safe, including the esc. If you're wondering why lower rated batteries can hurt the esc, Google ripple voltage and do some reading.
Last edited by Maj_Overdrive; 02-13-2016 at 11:39 PM.