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You can set up your new SSD with that version of the firmware and Intel® SSD Toolbox, however there is a newer version for both. It’s always recommended to keep the firmware and tools updated to the latest versions.
The latest version of the Intel® SSD Toolbox is the 3.5.2 and it can be downloaded from the following site: https://downloadcenter.intel.com/download/27656/Intel-Solid-State-Drive-Toolbox?v=t
The latest firmware for the Intel® SSD 545s Series is the 002C. You can update the firmware with the Intel® SSD Toolbox.
Regarding to the cloning part, I recommend you to use the Intel® Data Migration Software. This tool is used to clone the data of an old SSD to a new one. It works for SATA drives only. You can download this tool from the following site: https://downloadcenter.intel.com/download/19324/Intel-Data-Migration-Software?product=80098. There is an user guide in that site that I recommend you to check before using the tool.
Regarding to your last concern about the power consumption, the Intel® SSD 545s Series, as you pointed out, has a higher power consumption in active mode, therefore it’s expected to have a decrease in the time the battery can power up the system. However, it’s hard to say how much this change will affect the battery as there are other variables to consider. For example, the power consumption in idle state is considerable lower than the Intel® SSD 520 Series, so this may affect as well the time the battery will be capable of power up the system.
I hope this information answers your inquiries. If there is anything else I can help you with, please feel free to ask.
Have a nice day.