Originally Posted by Wolverine 1945
What are your thought about Battery Maintainers ???
I have one hooked to E450 battery & The battery in my lawn tractor that I use for Snow Blowing ???
Conventional flooded batteries self discharge at around 15% a month so if there are no parasitic loads (lawn tractor) there's no reason to keep any type of charger on unless unused for lengthy periods. (Discharge rate is less than 10% in freezing weather & 20 in HOT weather) I prefer to let a battery run down to 50% then apply a full conventional charge a bulk voltage & amps to "stir up" and mix the electrolyte & prevent sulfation rather than a small low volt, low amp constant current. That said...there is a benefit to keeping a battery topped up...and little risk of damage so sometimes the convenience outweighs the "best" solution. I have a battery tender for my scooters which sit most of the winter...but I only put it on for a few days at a time. In the coach...I simply properly fully charge by leaving it plugged in to shore power overnight then disconnect the negative batt wire and check every couple of months to see that I remain over 12.2V during the winter months when it is not used. Batteries will not freeze down to about 20 below if kept to 60% charge. (90 below if kept fully charged)
If I lived in the far north ...I might find a battery tender handy for the coach as well.
Now...since you mentioned battery maintainer...I will note that I'm simply referring to small, smart trickle chargers like the battery tender brand. I am not referring to any device that claims to reduce sulfation and maintain batteries with PULSE technology. These are snake oil and a waste of money...though some may work just as well as a battery tender since they include that charging routine as well as the snake oil.