I recently upgraded the headlight on my bike and now have an extra light that I would like to put on my wife's bike.  I ordered a wire from amazon however it does not fit the male/female adapters on the bike. Has anyone spliced the wires for an extra headlight or h have a solution?

Just took my Rad City 4 out for the spring and rode it twice, everything was great. Now it feels like I'm ridding in quicksand and power level 5 does not feel as strong. The battery is fully charged and the air in the tires are fine. Does anyone else have this and what was the fix. Rad was not very helpful when emailing them about this. Thanks for any help in advance.