Recommend a battery tender for AGM?

[Car Nut]

You are all overthinking this.
China Freight store.
Does not care what type of battery you have. I've had one on my hybrid for almost two years:

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[McSwine]

I'm using a CTEK MXS 5.0 on a '09 Boxster with an AGM battery...works great. I've got it plugged into the cigarette lighter (remember those?).

 

[HeyBales]

I have this:
https://www.walmart.com/ip/Schumach...12V-Fully-Automatic-Battery-Charger/586474517

Works fine and auto detects AGM.

Edit: Found the exact one I have.

I have the older style 10A version of that. Has been working great over the years.
None of the online descriptions or box mention sulfation repair - but the manual mentions it kicks in automatically like the Noco, but no real indication it's going.
I'm betting this one does it also, wonder if it changes light patterns like the Noco to indicate repair mode?

Mine doesn't auto-detect (have to do some research on how that is done, could truck's BMS be doing that during relearn, could it be doing it badly, and guessing AGM when it's not... ?), but not that bad.
No Lithium option though like many are including now, on the older one.

 

[HeyBales]

You are all overthinking this.
China Freight store.
Does not care what type of battery you have. I've had one on my hybrid for almost two years:

True - don't need much auto-detection when it only puts out 1/2 A max.

And you can hook it up every night to make up for what was lost that day, since that is so slow.

Better not get it to charge up an already low battery - unless you can be without a vehicle for probably days to get it done.

 

[MakinDoForNow]

It's been a month. It always gets to the solid green or pulsing green with no other lights. I do notice that when it is in this supposedly fully charged state if I open the door and wake up the truck it will drop all the way down to the red flashing light and then fairly quickly get back to the pulsing green in maybe 45 minutes. I haven't been sure if this is just it being confused by the draw it can't keep up with or a sign that the battery is bad.

It is not confused it just restarts the charge then optimization cycle. It verifies the fully 25%,50%,75%,100% charge status then starts the optimization routine. At 1 amp float charge taking 45 minutes to get back to optimization indicates that the "wake up" took 45/60 = 0.75 amp hour charge out of battery.

 

[Leuf]

Well I can say that the Noco Genius 5 does in fact make no difference at all, other than getting through the charging levels a lot faster, compared to the 2. Unplugged the 2, plugged in the 5 and it went to just pulsing green in a few seconds. A few days later, lights don't come on when I open the door as per usual even though the charger says it's got a full battery.

 

[MakinDoForNow]

Well I can say that the Noco Genius 5 does in fact make no difference at all, other than getting through the charging levels a lot faster, compared to the 2. Unplugged the 2, plugged in the 5 and it went to just pulsing green in a few seconds. A few days later, lights don't come on when I open the door as per usual even though the charger says it's got a full battery.

I just plugged my noco g5 on my hybrid Maverick that I left at home when I went on Xmas trip in my other one. It has original OEM 390 CCA 29 months used battery. Removed noco when returned Jan 4th. Drove it 32 miles on Jan 10. Went to start Jan 22 and battery showed 12.5v =. So the optimization routine must have cleared a lot of sulfation. Leaving any noco on will hold battery at max possible voltage when it does it's daily check and replaced the "random" draw followed by optimization if needed. TRUE a higher amp noco performs at the same speed as a lesser one after charging to 80%, that's the way they work. The difference between the 2 amp and the 5 amp is it will get to 80% 2.5 times faster with no difference if you start with an 80+% charged battery. 5 amp will charge even faster while the truck is pulling some current. Sounds like your battery may be highly sulfated and will get to 100% voltage but has very little reserve capacity left. If dealer will put your battery on the over night charge test it may fail even with the 10 second hand held tester passing the battery. Tell service rep that you have to keep maintainer on battery, etc assuming you are under 3/36 warranty. In my other maverick my dealer replaced it's BXT99RT4A with a BXT99RT4A MAX (has 490 CCA & larger RCA) due to bad cell in OEM (apparently would fully charge but had internal short). Replacement was not AGM but was a higher capacity battery. Good luck.

 

[Red Pepper Maverick]

https://www.harborfreight.com/4amp-...ntrolled-battery-chargermaintainer-63350.html

 

[SLJ]

Remember to not connect it to the negative battery terminal.
Don't ever connect anything to the negative battery terminal.
Attach the negative clip to another ground point or you will confuse the on board Battery Management System.

 

[Falcon first]

Deltran Battery Tender 3 amp version. I use it on my two BMW’s with AGM batteries and my Mav hybrid with flooded. I drive only 1,000 miles a year on one BMW and it brings it back in 2-3 hours and two hours on the one that gets driven 2,000 miles a year. The Mav. gets driven a lot but a lot of deep sleep in the winter, 2-3 times a week. Brings it back in 2-3 hours to solid green. Get the 3 amp not the 1.5 amp.

 

[Leuf]

What I have found is that if I go out to the truck on the 4th day and just put the key on for a few seconds then everything will turn on as it should on the 7th day. So it appears to be based on a timer or the battery management is seeing something with the key on that it does not when off and there is no possible work around to have lights come on beyond 5 days, short of rewiring the lights to take whatever stupid module is disabling it out of the equation. The maintainer is not connected directly to the battery negative and the battery tests okay.

 

[Randy C]

You need Noco Genius 5. I use this for charging the AGM battery in my Maverick. It charges to 13.0 volts with no issues!

That's what I use. I mounted it under the hood. I plug it in about once a week, overnight. The charging system in these Mavericks just doesn't seem to give a proper charge... '25 AWD hybrid

 

[Sluggo48313]

CTek MXS 5. I have a couple of these and they seem to work better than the Schumachers and Nocos I've tried over the years. I've used them on both flooded and AGM. It does a good job of deep charging the battery then floating it. A lot of the other chargers I've tried may charge faster, but then not turn back on when the battery is low months later (for cars stored in winter). The CTek does keep it up.

https://www.amazon.com/CTEK-Maintai...phy=104521&hvtargid=pla-4584482468593001&th=1

 

[Packer Bill]

A lot of the other chargers I've tried may charge faster, but then not turn back on when the battery is low months later (for cars stored in winter)

My Noco Genius 5 charges again when the battery needs it.

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