Problem

In Kaspersky Security Center Network Agent (klnagent) 15.1 and more recent versions, klmover tool requires klnagent uninstallation password to re-connect a managed host to another Administration Server: https://support.kaspersky.com/ksc/15.1/227839
If the password is not set in the policy, it is not required to be specified in command line via the parameter: -nauninstpwd

If klmover is executed directly through a Command Prompt, the parameter will work as expected. However, if klmover is started by a .bat file, the uninstall password cannot be passed to command line properly. 

Solution

echo command

Qwerty12 is the klnagent uninstallation password and 192.168.1.221 is the IP address of KSC Server.

echo Qwerty12|"C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\klmover.exe" -address 192.168.1.221

cmd doesn't parse quotes and spaces in echo properly: If klmover is started from cmd and the password contains characters requiring quotes, klmover should be run from Powershell.

Powershell has a Start-Process command, allowing to run a process as a different user, in this case it can be used in a batch script:

cd "C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\" C:\Windows\System32\WindowsPowerShell\v1.0\PowerShell.exe -Command "Start-Process powershell '-Command echo <password>|.\klmover.exe -address <address>' -Verb RunAs"

Example:

cd "C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\" C:\Windows\System32\WindowsPowerShell\v1.0\PowerShell.exe -Command "Start-Process powershell '-Command echo Qwerty12|.\klmover.exe -address 192.168.1.221' -Verb RunAs"

Text file

Alternative method is to save the password in a text file password.txt 
Remember about the option Copy entire folder to the installation package when uploading the installation package, otherwise, password.txt will not be copied to target hosts.  

"C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\klmover.exe" -address 192.168.1.221 < password.txt

In this case, special symbols in the password can be passed correctly to klmover as command line parameter.

Previous versions of klmover are not compatible with klmover in klnagent 15.