infineon and precharge circuit/stupid question?

edited.

Do these controllers already have a precharge circuit?

Mine is an 18fet 4110 em3ev

There is no large spark @ 18-24s when connecting battery with the controller and leads for on/off switch are open. This must mean there is a precharge integrated in the controller already? either the caps never drain down, or there is a precharge circuit alread in the low voltage on/off circuit?

As is, I don't see much need for a breaker/full load switch, or maybe even a fuse?

What's all the hoopla with precharge connectors, don't most controllers do this?

edited and bumped

anybody?

I am assuming you brought the controller from em3ev.com have you emailed em3ev I think that be best first place to ask for sure.
Having a fuse is not a bad thing, I personally would recommend it as if something went wrong that fuse may just be your protection.

Thanks for the input, I agree and will ask paul if I want his opinion.

The question is oriented to the community and concensus about controllers, on/off, and precharge in general, as I'm not sure I fully understand.

Just an update, the infineon will eventually drain down when disconnected which creates the benefit for precharge- but I have no need for it since that seems to take days.

Turn on key or killswitch. disconnect battery. charge. reconnect and turn on.
Unless there's days inbetween or you try to draw power when battery is disconnected, there is no spark.