Car battery questiom

[DWBOX2000]

I can’t open my trunk to charge battery so I bought a charger to charge through cigarette lighter. Now it gives me a choice between AGM, leaf acid or lithium. I know it not lithium and that the battery is sealed. Any most likely battery used?
I had no idea there was different types.
Thanks.

[RANDY P]

Lead acid.

AGM=Absorbent Glass Mat- IE Optima bat.

rjp

[onewhippedpuppy]

Factory battery should be lead acid. AGM would be an upgrade and no OEM uses lithium that I’ve ever seen. I have lithium in my RX8 because I installed it for the hell of it.

[dw1]

Originally Posted by onewhippedpuppy

Factory battery should be lead acid. AGM would be an upgrade and no OEM uses lithium that I’ve ever seen. I have lithium in my RX8 because I installed it for the hell of it.

Some factory batteries are AGM - for example most if not all Mercedes-Benz models over the last 15 or so. (Fyi, I just replaced the OEM starter battery in my MB a few weeks ago and the original was a Varta brand AGM.)

Many hybrids & EV's use lithium. Lithium batteries are also a factory option for the track-focused Porsche models (GT3, GT2, etc.) and original equipment in the McLaren MP4-12C.

An on-line search on your car's brand and model should tell you which battery your car came equipped with.

[DWBOX2000]

Thanks All, I’ll take a look.

[DWBOX2000]

Cars a 986. I found receipt from previuos owner. Just says new battery @ $226 a couple years ago. I’ll check owners manual too.

[onewhippedpuppy]

Originally Posted by dw1

Some factory batteries are AGM - for example most if not all Mercedes-Benz models over the last 15 or so. (Fyi, I just replaced the OEM starter battery in my MB a few weeks ago and the original was a Varta brand AGM.)

Many hybrids & EV's use lithium. Lithium batteries are also a factory option for the track-focused Porsche models (GT3, GT2, etc.) and original equipment in the McLaren MP4-12C.

An on-line search on your car's brand and model should tell you which battery your car came equipped with.

I’m yet to see a factory AGM but I’m sure they exist. In the last couple of years I’ve replaced batteries in a 2010, 2013, and 2014 Mercedes, 2021 Jeep, and 2020 Ram, all lead acid. Lithium is still incredibly rare in normal cars, and I made the assumption that he wasn’t replacing the battery (singular) in an EV. So I may have made some reasonable assumptions.

986 is 100% a lead acid, I’ve replaced a lot of those.

[DWBOX2000]

Thank you very much.

[dw1]

Originally Posted by onewhippedpuppy

I’m yet to see a factory AGM but I’m sure they exist. In the last couple of years I’ve replaced batteries in a 2010, 2013, and 2014 Mercedes.....all lead acid. .

This is the original OEM battery from my 2013 Mercedes-Benz C-class (W204). Notice how it is clearly labeled "AGM". I've owned the car since new so I know the battery was not previously replaced. One can also tell that it was the original OEM battery by the (now superseded) M-B part number. The fact that it was an AGM (and that most of my driving was relatively long distances) may be why it lasted so long.

[rfuerst911sc]

If your battery is discharged to the point it won't activate the trunk release you will be charging for a looooong time through the cigarette lighter receptacle . I don't think it's designed to charge a discharged battery . It is designed to " top off and maintain " the battery .

The wire gauge is small so not much amperage flow . I know you are in a jamb and I hope it works for you . Good luck

[onewhippedpuppy]

Originally Posted by dw1

This is the original OEM battery from my 2013 Mercedes-Benz C-class (W204). Notice how it is clearly labeled "AGM". I've owned the car since new so I know the battery was not previously replaced. One can also tell that it was the original OEM battery by the (now superseded) M-B part number. The fact that it was an AGM (and that most of my driving was relatively long distances) may be why it lasted so long.

Interesting, I replaced lead acid in my 2013 and daughter’s 2014 Mercedes. They had the caps on them, not sealed like that one. But now you’ve got me questioning myself so maybe I’m FOS.

[DWBOX2000]

Battery is not dead. I’m just topping off.
Thanks.
I need to pull the wheel liner again and keep fishing around for cable. If I can’t find, not sure what I do.

[GH85Carrera]

Originally Posted by onewhippedpuppy

I’m yet to see a factory AGM but I’m sure they exist. In the last couple of years I’ve replaced batteries in a 2010, 2013, and 2014 Mercedes, 2021 Jeep, and 2020 Ram, all lead acid. Lithium is still incredibly rare in normal cars, and I made the assumption that he wasn’t replacing the battery (singular) in an EV. So I may have made some reasonable assumptions.

986 is 100% a lead acid, I’ve replaced a lot of those.

My wife's 2017 Macan came with a AGM battery. I called the dealership to get a price on a replacement. They wanted over 700 bucks, and that is not installed!

I bought a Interstate AGM battery for $260 bucks and had to use my OBD2 Autel reader to enter a part number, battery type (AGM or wet cell) serial number and amp hours. I used the old part number, I added one to the serial number, and the rest was easy.

I replaced the exact same battery in my 85 911, and only had to reset the clock for the time it took me to do the swap. No computer needed.

[DWBOX2000]

I swear this car wants me to sell. I had charger working last night. I went to set up today and it blows the 15 amp fuse before I plug charger into wall. I also bought this do dad to check the voltage through the lighter. That works fine when I replace the fuse. I contacted company.

[Dantilla]

My first generation Miata (1993) came with an AGM battery.


Useless tidbit: The battery is in the back passenger side corner of the trunk.
With a 160 pound driver, the weight is equal on all four tires.

[look 171]

I had AGM batteries in my 4 runner since the factory battery died. Normally, I use a typical trickle charger to top off over night if it hasn't been driven for 3-4 weeks. Works just fine. Anti-Gravity's Lithium in my 911s. I just love those batteries. it cuts itself off and there are three cranks left after a key-fob type device is depressed.

Battery Tender is what I use to top off the AGM. Maybe I am doing it wrong?

[dw1]

Originally Posted by onewhippedpuppy

Interesting, I replaced lead acid in my 2013 and daughter’s 2014 Mercedes. They had the caps on them, not sealed like that one. But now you’ve got me questioning myself so maybe I’m FOS.

It is quite possible that the Mercedes-Benz vehicles you worked on did not have the original factory equipment batteries. It is unfortunately quite common for the expensive OEM AGM batteries to be replaced with the lowest cost alternatives (non-AGM lead-acid) by many service organizations and unscrupulous dealers trying to maximize their profit, and owners trying to save money.

I've heard "....you could pay a lot of a Mercedes (or other OEM brand) battery or save some money with this much cheaper one...", leaving out the option of an OEM equivalent aftermarket AGM battery which is the option I chose when I did it myself.

[908/930]

AGM have been used as OEM for quite a while, my 2004 BMW 530i was equipped with one.

DWBOX2000, your charger blew the 15A fuse for the lighter socket? Possibly capacitors in the charger pulling the amps.