Make sure you only undo ONE post at a time. Run a zip tie through all of the cable ends and label where it came from i.e. back battery pos. or front battery etc.. Before disconnecting an other post make sure you did not forget a cable. Do same for all battery post. The reason I say this is upon my disconnecting the batteries, I failed to look for cables I missed. When I was all done low and behold there was a cable that I missed, it had fallen behind the back battery.
Retired and never looked back