Using a battery maintainer

Used a Battery Tender with my Tundra without disconnecting the battery and never had a problem.

Disconnect negative

Connect Battery Maintenance Device

Problem resolved. 100% guaranteed.

Do not understand ??? Why is this even an issue ???

"Do not understand ??? Why is this even an issue ???"

No issue, just a difference of opinion.

I keep a battery maintainer hooked up to our RV's engine starting battery 24/7 while the RV is in the backyard being stored.

We're on the RV's 2nd set of chassis batteries in 13 years, and the first OEM chassis battery set was still working great when I replaced it just in case.

pnichols wrote:
I keep a battery maintainer hooked up to our RV's engine starting battery 24/7 while the RV is in the backyard being stored.

We're on the RV's 2nd chassis battery in 13 years, and the first OEM chassis battery was still working great when I replaced it just in case.

Similar story for me. I replaced the original battery after 15 years because I was going on a long trip.

I just disconnect the batteries. No problem even at 55 degrees north. I check the batteries every month or two just to reassure myself. If the voltage got down to 12.4 I would charge.

I got an LED display that plugs into the cigarette lighter that shows voltage. My phantom load on my Dodge diesel 2006 truck is 35ma and that I confirmed from the factory to be correct. I keep a battery maintainer velcroed to the side of the battery with it's power cord dangling out the front grill. When I leave the truck long enough that the LED display drops to 12.6 volts, I plug in the maintainer and let it run. Usually within a day or 3, the voltage is back to 13.6 or what ever the float voltage is.

A good tip is to check battery water levels and the specific gravity of each cell. Loosing water and low SP are strong indicators the battery is on it's way out and no amount of conditioning or maintaining is really gonna help. Cold weather is harder on these batteries than warmer as well.