Lightning, outboards and disconnecting electronics

[Sailorman Ed]

So I know that multihulls have a higher incidence of lightning issues. I am also aware of some lightning strikes have incapacitated inboard engines. But I have not seen anything about newer outboards being affected. I am installing a new 25 hp Yamaha which has more electronics than the old outboards. And I will add an interface cable to tie the outboard to the ships computer running OpenCPN. The computer will interface with other instruments via a multiplexer.



In the event of an electrical storm, I plan to disconnect the VHF antenna from the VHF. I would also like to disconnect the chartplotter but as yet haven't come up with a convenient method to do so. So a couple questions:

1. Do I need to worry about the lithum batteries with lightning?
2. Other than disconnecting the VHF antenna, what else should I disconnect to minimize damage from lightning?
3. Do the same for the AIS antenna?
4. Is a switch isolating other components from each other enough? And a SPST switch enough or do I need a knife switch.
5. And even if I disconnect the chartplotter electrically, is it safe?

I am still at the stage I can make some electrical changes if warranted.
I have never been hit before although I have been caught out in open water with a couple thunderstorms and I duck each time it hits close by.
Ed