i think it depends on how you program the rest of the parameters. there is an engineer on endless sphere who posts under the name of kepler and i believe he is one of the first ones to suggest the 18amp current limit. the reason he did this is because his version of the settings involved setting the speed limit to 100% on every level of PAS and then using the current limit to act as a gate that allows certain amounts of power into the motor. now if you used these settings with a 25A current limit and say for example had PAS 9 set for 100% current and 100% speed you could easily overheat the bbs02 and damage the controller. this was more important on the older bbs02 models which shipped with weak mosfets but it is still possible on the newer bbs02b models, especially in warm or humid climates. if you do not need 100% of the power out of the bbs02, you can get an extended life out of your motor if you leave it at a lower power setting. these are the settings i personally use for my cargo bike with a 750w 48v bbs02: top speed = 70km/h

max current = 18A

start current = 10%

keep current = 60%

slow start mode = 2

startup degree = 4

current decay = 8

time of stop = 250ms

stop decay = 1000ms

PAS current limit | PAS speed limit

10%|100%

15%|100%

20%|100%

30%|100%

40%|100%

50%|100%

60%|100%

75%|100%

85%|100%

100%|100%

these settings have worked well in my opinion for a good balance of less wear on the drivetrain and motor but plenty of power for carrying heavy loads/climbing hills. for some references on the kepler method see this blog post and this thread where he originally posted his finding. now of course if you are using a different method of programming that involves utilizing the speed limits more closely then you can probably ignore everything i said and keep the motor at 25A :)

no that is not correct im not sure where you heard that. bbs02 is capped and designed to run at 25 amp, continuous. def leave it at 25 amp.