Hi
I recently purchased another flipsky 4.20 mini after I destroyed the other one by connecting it with reverse polarity.
This new one had a diode connected right at the input leads. As this was in the way for me, I removed it and planned om connecting it at the input plug in stead. But alas - I forgot to take a picture!
IT is a 5kp51a diode. From the datasheet I can read that it has a very high break down voltage, which is why I am not sure how to connect it.
Can someone help me?
The line should connect to the positive wire.
Ah yes, the classic “blow the fuse as reverse polarity protection” trick. 
So its just for reverse polarity? 
I think that design is OK for lithium powered devices as there should always be a BMS capable of resetting.
And thanks!
this one is much easier
Actually, most of us bypass the BMS for discharge and only use it for charging and balancing.
Whoa - living life on the edge! I am a ebike kind og guy, so don’t know how you guys do it. Seems risky! 
It’s more risky if the BMS shuts off and you loose brakes in traffic, fall off, and get run over.
body > battery
I guess thats true for eskate
We can slow down. Quite fast actually just hop off.
Well the whole BMS situation is a very controversial topic. In my local DIY group we always try to use a discharge BMS or at least a fuse when possible because we really want to avoid a battery fire. In my experience the flipsky V.E.S.C has a lot highe chance to randomly die while breaking than a bms so the first step to make breaks safer is to use more reliable ESCs.
De solder the diode from the pcb there Maby a silk screen symbol of the diode and how it should be on the pcb, post a pic if you are stuck
I have soldered the diode onto the connector - everything is fine