Gents, I've been using trickle charger on the bike for years. A few months back a close mate of mine who is a firey said he went to a house fire which burnt down, started with the trickle charger on a guys harley. Then last night I heard of a another fire where the bloke nearly lost his kids, started from a trickle charger hooked up to a go kart at 2 in the morning.
If I'm not riding for a while I just use mine for a couple of hours every few days - but only when I'm actually in the garage.
I was in the RFS NSW the fire trucks are always plugged into battery tenders, & I've always kept my Harleys plugged into a battery tender since about 2008, & never had a problem.
Been using them for years, shit happens, 211 motorcyclist deaths in 2019, you gunna stop riding?
I have 3 of them, and they are the harley battery keepers,, one for ride on mower , one for Roadking, one for the boat.
Mine have always been connected since 2007 and I’ve never had a problem.