I use Deltran battery tender and have 5 of them. I leave them hooked up all the time and have never had a battery boil dry. I had automatic watering system on my truck camper when I had it and added a small amount of water a year. I have them hooked to my ATV, tractor, battery in my enclosed trailer, cars that are not driven much. I also have a Harley brand one on my Harley, If I had known now what the Harley battery tender was I would have just gotten another Deltran for it and saved some money.
Well worth the money to not have to worry about the batteries all of the time.
I also keep my RVs with the newer converters plugged in all the time. I am going to have to buy another one now for the MH starter battery for this winter even though we plan on using it more and head further south a few times this winter.
From the Deltran web site:
"Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode)."
This is the same as the newer converters in RVs and they are fine to keep plugged in all the time.
Butch
I try to always leave doubt to my ignorance rather than prove it
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