Remove/replace battery box on NB series

How do I upgrade my PC550 (B235 inverter) to a PC562 (B265)

Open the existing battery box. Disconnect the power strip from the inverter. Disconnect the battery cables from the battery negative terminals. Disconnect the battery cables from the battery positive terminals. Remove the batteries and place to the side to be reused if needed. Disconnect the red wire from the inverter at the fuse block. Disconnect the grey communication wire from the back of the meter. Remove the two screws on the top feet of the inverter. Remove the inverter out of the battery box. Remove the (4) screws that attach the battery box to the cart. Remove the battery box. Reverse the above steps to reinstall a new battery box.