It’s not quite that bad but your point is still valid. The battery pack is probably somewhere between 500 and 800 vdc rated taking the best case scenario of 800 volts it would require a 1500 Amp connection. That is usually a bus bar not Cable.
800VDC @ 1500A = death (or a blown off hand or arm if you're lucky). The current thru you would generate enough heat to instantly boil any soft tissue in the current path.
1500A busbar = 1" x 2" copper bar for a length of 1' or less. More if the length is greater.