Choosing fuse for 2S li-po
It sounds like you want either an EFuse or a Overcurrent Detection IC. Like the names implies, these are devices that detects how much current is passing through your circuit and will disable the load if the current is too high.
EFuse Pros: Easy to intergrate into a circuit, small in size
EFuse Cons: Thermals could be an issue depending on the current draw, tolerance for overcurrent trip isn't as tight
Overcurrent Detection IC Pros: More accurate of a current trip point, main IC doesn't heat up due to low current draw, can select transistors for overcurrent trip
Overcurrent Detection IC Cons: Might be more expensive, requires more parts, slightly more complex design
It's going to be up to you to decide which one you want to use, but you may be able to use  EFuse if you're okay with the wider tolerance. As long as the internal resistance isn't too high, you probably won't have to worry too much about heat dissipation.