I was just reconfiguring my motors in BF before I tested the Nazgul id just fitted a new ESC to when it went bang. 
It turned out to be the capacitor had popped, I have know idea why as it was fitted correctly. I now only have a 50v one left apposed to the 35v will fitting this be an issue???..
No. That’s the max voltage.
Cheers mate Ill pop it in,
bloody shit me self when it popped 
I wonder if 35v was to small 
Purple bit to negative, right?
Only time I had a cap blow I’d got it the wrong way around.
Hmmmm now you’ve got me thinking Ill go back and check 
I’ve done this when building before.
I didn’t realise they were handed until it went pop and sort of dribbled stuff over the frame.
They should have + & - on them.
Some do…
FYI 
They do, big thick band running down one side with lots of - signs printed on it
That s negative, the black wire one 
The longer leg is the +ve 
only on new ones 
I used to blow up capacitors at school all the time on purpose. the teacher said she’d start charging, so next day I brought in £10 and asked how many that’d get me!!
Does sound like it might have been soldered backwards though!
Haha that reminds me of an incident at the electronics factory I served my apprenticeship. We were just starting off with surface mount stuff and had a brand new reflow oven. The first boards going through had some very large caps that were through hole. 2 things went wrong. The legs of caps hadn’t been crimped correctly, and nobody checked for height clearance through the oven. The end result was dozens of massive caps falling onto the ceramic IR elements and what sounded like a giant popcorn machine. The operator was also found hiding outside the fire exit smelling of . As the apprentice I got the wonderful job of cleaning it all up before cutting out and extra 5mm clearance on the internal hood.
