[Too Many Projects]

I've had the 2 bank Battery Tender for at least 10 years. I have 6-8 batteries I store in a heated building every winter and keep them charged with it. I don't leave it on any one for an extended time. Once the green light goes solid, for storage mode, I leave it for 1 week and then move it to the next battery. Once they all have been charged, I stop charging for 6 weeks and let them rest. I have 4 NAPA Gold batteries that are 6-7 years old and still perform like new all summer.
I had to buy a new battery for my Harley this year. It is the second one since new and the bike is 21 years old. The original that came in the bike lasted 11 YEARS, most of them with this charger and the first replacement lived for 10 years. With a service life like that, I go right back to the dealer and pay the price for a new one.