Argos drill motors have a static winding resistance of around 1 ohm, giving them a stall current of ~12A at 12V; I've been running mine on £6 chinese 20A ESCs for a few events now without much trouble (ok, so I had one FET die, but that's more to do with the fact it had no cooling and was wrapped in heat shrink). It's going from forward to reverse suddenly that causes the high current peaks, but those are very short lived unlike a stall... If they had an 85A stall at 12V they'd be giving out more than 1 KW, which means it could give a Bosch 750 a run for it's money :P
Basically, you're never gonna toast a TZ85 in a fight even if you ran your Lipo straight through it; they say 85A, but the FETS in there are collectively rated to 260A continuous, and they've been shown to handle peak currents around that; You'd blow your battery long before you blew the ESC (Which is potentially worse, but not the point :L)
The fights at the Heavy events are 3 mins long with up to 30 feathers in the arena at once (though it's usually less than half that)
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