Fuses for LIPOs on Featherweights

[Roboteernat]

Continuing using this post to ask another fuse related question.

I have a 65-130c 3.3A lipo battery for my feather as well as a 35-70c 2.65A lipo both 4s.
When calculating the fuse rating using the C value, do I use the maximum C rating, resulting in a maximum 429 amp fuse for the first and a maximum 185 amp fuse value for the second?
In battle I would have to change the fuse accordingly if swapping battery but is this correct?

How likely is it that if I standardise and fit a 150 or 100 amp fuse that it would blow on the bigger battery.

Understand that it is to protect the lipo and stop it from drawing max but the minimum 65c rating is higher that the proposed 100 or 150 amp.

Although I'm great at electronics, can someone just confirm fuse rating regards C please.

Nat