Separate names with a comma.
Yeah, this could have been an "off-by-one" error, which would directly short any blade whose terminals were shorted by the harness...
You could have moved the jumper and shorted the module (+) and (-). Not a very good design of the terminals of the homemade battery. No...
I suspect this is user error. Troubleshooting: 1: Post a top-down, high resolution picture of the entire pack with the blade tap...
They all have good artwork. #1 and 3 might come with a bit less trademark infringement than the others.