Adding 2nd LFF cage to HP ML350 gen9 (enabling 16 drives support)

[Limo]

Hi, 

I have HP ML350 gen9 LFF with b140i and 8 LFF cage (765819-425).  I need to convert it to support 16 LFF drives. By my research i need these items to do that:

1. HP ML350 Gen9 8LFF Hot Plug Drive Cage Kit  726547-B21

2. HP Smart Array P840/4GB FBWC 12Gb 2-ports Int SAS Controller 726897-B21 (DOES IT COMES WITH 96W BATTERY and cables required to connect to backplanes??)

3.  2 pcs HPE ML350 GEN9 Smart Array Cable Kit 765650-B21   8xSAS to 2x miniSAS cables

is this purchase list correct? Or i should go with adding SAS expander way?

[xh63]

Just wondering, if the configuration above works for you? Please let me know as I am in the same boat. Billions of thanks in advance.