Stop using butt connectors that don't protect from water ingress! Moisture is eventually going to get in there and start the corrosion process which could contribute to or cause all kinds of electrical problems in the future.
I use these that have some solder and heat shrink. They work great. https://www.amazon.com/dp/B0BKSJQC9Q?psc=1&ref=ppx_yo2ov_dt_b_product_details
I use these that have some solder and heat shrink. They work great. https://www.amazon.com/dp/B0BKSJQC9Q?psc=1&ref=ppx_yo2ov_dt_b_product_details