I won’t go into all the technical reasons everyone else has, I’ll simply share what our team goes by for measuring batteries with a Battery Beak:
Ideal Competition Battery:
Sub-Optimal Comp Battery:
≥0.016 - ≤0.019 Ohms
Pit Battery (for charging pneumatics, testing, etc.):
≥0.020 - ≤0.028 Ohms
"Dead" Battery / Do Not Use:
New batteries generally come between 0.011 - 0.016 Ohms in my experience. We got one that was at like >0.025 Ohms out of the box once, and we sent it back (don’t buy cheap batteries off of Amazon, kids). That said, it is important to note that the internal resistance measured by a Battery Beak is affected by the quality of the connection between the Anderson connector and the battery lugs (including all the respective wire crimps).