This is not an effective way of asking for empirical data on how much current the strips can carry. That data not only exists it has been posted in easily digestible format in one place.
Depending on who I asked, I was told to use 0.15 X 7mm or 0.15 X 8mm Strips. So I used 10mm wide strips. a 2cm long strip between 2 cells of .15 x 10mm has 0.000912Ω, but lets call it 0.001 ohm, rounding up a bit. it's easier to calculate this way. At 10 amps, its dropping 0.1 watt and 0.01 volts between the 2 cells. 0.1 watts doesn't sound like much, but if you consider it's between every cell, then it starts to add up. Watts is Current X Resistance Squared, so 15 amps is .225 watts. 20 amps is .4 watts, between each cell.
From what I've read and been told, 6.5 amps per square MM of Nickel is about the limit of acceptable for battery strips between cells. ideal would be less. As you can see, that works out to just about 1 amp per mm of width with .15 strips.