I've been using a battery tender on my 2015 WR250F for about six months now. I have a pigtail wired into the main battery so I can quickly and easily plug it in when I'm done riding. Was chatting with a buddy about using a battery tender and he said he had read many times that you should disconnect your battery from the rest of the bike before using a battery tender (specifically just the negative cable). "They" say to do this to protect the ECU and other expensive electrical components should the battery tender malfunction or short out and damage them. I had never heard this and have never had a problem with simply plugging in the battery tender. But if it's best practice to disconnect the battery to protect the bike, I will. What say you, experts?