I just wanted to add my own +1 to this. I had the exact problems of intermittent and then complete loss of functionality of the trackpad and keyboard on an Early-2015 MacBook Pro. I’m in Europe so I bought this part off of Amazon.de: https://www.amazon.de/dp/B0759H3KKR/ref=pe_3044161_185740101_TE_item and it took all of 30 seconds to replace. The part even comes with the double-sided tape to hold it on the battery. It seems to be maybe 1-2cm longer than the OEM version, but I just had to prebend it a bit.