- Joined
- Jun 30, 2026
- Messages
- 2
I have a couple Odyssey Extreme Group 65 batteries in my truck. They are a few months old. I would like to "permanently" install a maintainer in the truck and have the option of plugging it in when the truck won't be run for more than a few days and sometimes weeks (which happens often). I don't plan on using the "maintainer" to charge any batteries from a deep discharge.
Per Odyssey The recommended float voltage for ODYSSEY AGM2 batteries is 13.6 volts for a 12-volt battery at 77°F (25°C). They also say Regardless of temperature, the minimum charge voltage is 13.2 volts as lower voltages will damage the battery grids and shorten life.
Odyssey recommends the Battery Minder 2012 AGM. After some reading on here, I know @f355spider likes this charger. I have also read about the Battery Minder 2012. I recall a posting (I think) from @f355spider spoke to Battery Minder and they mentioned that they lowered the float voltage. I was not entirely clear if that was on the 2012 or also on the 2012 AGM? What is the typical/minimum float voltage of the 2012 AGM? Does the 2012 AG supply constant float voltage or some kind of "smart" operation when the battery is fully charged?
I recently purchased (still within Amazon return window) a Noco Genius GEN5X1. I have it hooked up and after some VERY limited testing, it seems the float voltage varies from 13.2v to 13.3v. in about 60 to 65 degree temps (no other temperature range tests done). Also, I am not clear on whether the Noco shuts off every so often and is not charging and that is the "smart" function. And if so is that bad for the Odyssey?
I sent a couple messages to Odyssey Technical asking about the Noco and received no response. I then sent a message to Odyssey sales and got a response the Noco GEN5X1 is fine. I asked if they have verified the float voltages and she responded no. So of course, my follow up was then how can you say it is fine. Her response, that is what I use at home in my garage! I would have to do more testing to see if the voltage ever drops below 13.2v.
Another option I was looking at is the Victron IP67 charger. I like Victron products and use them in my camper. With the Victron I can select whatever float voltage I want. I am not sure of their algorithm, etc and whether it is temperature compensated. I think @04GTO likes this charger.
Whichever one I select, I want to mount it in the truck. Ideally under the hood somewhere, though real estate is at a premium. I may have to mount it in the cab somewhere, but first choice will be under the hood.
The Noco wins out for permanent mount. It is designed for under hood mounting and is the smallest form factor. The Victron is IP67, so that should be good as well, though it much larger. I am not sure about the Battery Minder 2012 AGM mounting under the hood. I don't anticipate a wet environment.
Another question, can these chargers be attached to a car battery and plugged in when the car is started? I ask for the occasion where I remote start the truck from inside the house and have yet to unplug.
Thanks in advance for sharing your wisdom.
Per Odyssey The recommended float voltage for ODYSSEY AGM2 batteries is 13.6 volts for a 12-volt battery at 77°F (25°C). They also say Regardless of temperature, the minimum charge voltage is 13.2 volts as lower voltages will damage the battery grids and shorten life.
Odyssey recommends the Battery Minder 2012 AGM. After some reading on here, I know @f355spider likes this charger. I have also read about the Battery Minder 2012. I recall a posting (I think) from @f355spider spoke to Battery Minder and they mentioned that they lowered the float voltage. I was not entirely clear if that was on the 2012 or also on the 2012 AGM? What is the typical/minimum float voltage of the 2012 AGM? Does the 2012 AG supply constant float voltage or some kind of "smart" operation when the battery is fully charged?
I recently purchased (still within Amazon return window) a Noco Genius GEN5X1. I have it hooked up and after some VERY limited testing, it seems the float voltage varies from 13.2v to 13.3v. in about 60 to 65 degree temps (no other temperature range tests done). Also, I am not clear on whether the Noco shuts off every so often and is not charging and that is the "smart" function. And if so is that bad for the Odyssey?
I sent a couple messages to Odyssey Technical asking about the Noco and received no response. I then sent a message to Odyssey sales and got a response the Noco GEN5X1 is fine. I asked if they have verified the float voltages and she responded no. So of course, my follow up was then how can you say it is fine. Her response, that is what I use at home in my garage! I would have to do more testing to see if the voltage ever drops below 13.2v.
Another option I was looking at is the Victron IP67 charger. I like Victron products and use them in my camper. With the Victron I can select whatever float voltage I want. I am not sure of their algorithm, etc and whether it is temperature compensated. I think @04GTO likes this charger.
Whichever one I select, I want to mount it in the truck. Ideally under the hood somewhere, though real estate is at a premium. I may have to mount it in the cab somewhere, but first choice will be under the hood.
The Noco wins out for permanent mount. It is designed for under hood mounting and is the smallest form factor. The Victron is IP67, so that should be good as well, though it much larger. I am not sure about the Battery Minder 2012 AGM mounting under the hood. I don't anticipate a wet environment.
Another question, can these chargers be attached to a car battery and plugged in when the car is started? I ask for the occasion where I remote start the truck from inside the house and have yet to unplug.
Thanks in advance for sharing your wisdom.
