If you're talking about a kick, the kick functions only at 1.3ohm to 3ohm anything outside of those it can have issues.
"IMR batteries are REQUIRED. Boosting uses more current (amps). LR attys/cartos also use more amps. Some people will use LR attys/cartos and vape at boosted levels. The Kick is designed to accommodate these higher-level current (amps) demands but only IMR batteries have the ability to deliver the amps required. The Kick is designed to be used ONLY with IMR batteries. The Kick performs best with attys/cartos in the 1.3 to 3 ohms range." from their site.
EDIT* I see you're talking about a shortstop fuse. I don't think they allow you to exceed 5amps, or they will but they'll probably fuse out eventually at anything above that.
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The PTC fuse used in the VapeSafe2 is rated for a hold current of 3.5 A, which means that it can carry a continuous current of 3.5 A safely without tripping. Its trip current is rated at 6A, which means that it is guaranteed to trip if 6 A or more is passed through it. If a current between 3.5 and 6 amps is passed through the VapeSafe2, it will trip after an indeterminate amount of time (typically 5-10 seconds or more)
The Shortstop is slightly more lenient...
The time it takes to intervene depends on how much current the battery is pumping through it, if you exceed 5 amps by a large margin it will react much faster than if you only go slightly over 5 amps. Using the standard test that ANSI/NFPA 70 (the national electrical code) specifies, it will limit 8 amperes within 5 seconds starting from an ambient temperature of about 77 degrees Fahrenheit ( 23 degrees Celsius ), however at 10 amperes, it will intervene in about 1 second under the same conditions.
Both quotes are directly from the manufactures site.
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http://www.e-cigarette-forum.com/forum/apv-discussion/411561-cgr18650ch-natural.html#post9391895