I'm on my 3rd battery on my 20 year old truck. When the bike is not on the road, it is also on a trickle charger. January, this year, I changed out the motorcycle battery. It did not want to turn the motor over in 20 degree weather. The guys checked out the battery said the old one was still good when I got the new one. My motorhome is on trickle chargers too. I am slowly moving away from the Northern Tool charger to the "Battery Tender" brand. I had a boil out from one of the Northern Tool chargers on my deep cycle battery on the motorhome.
Along with a quick connect harness for the battery itself. I'm hoping it will significantly extend the battery life, especially since I now live where there is not a year round riding season.