AOS Clustering , Load balancing and Fail Over

Hi all,

I have a enviornment with 10 AOS service Installed in 2 Servers  and I've Clustered 
4 for batch Server , 2 for Specific User Group and another 4 for all other users.I'm not using dedicated load balancer  and all the Clusters are Non load Balanced .I have following Question.

the way I configured will it automatically balance the load across AOS's in Cluster ?

if yes based on What it will really balance the load ?, based on Workload or based on Number of Concurrent users connected to the each aos server ?

if I add all the aos 'es to the client configuration will it utilize all the aos'es in parallel to do the processing ?

thank you,

Amith Prasanna