Battery type help

**mrg_B8TFSi** · 01-31-2023 12:09 PM

Hello I’m looking and I can’t seem to find any information as to the type of battery I have, and my battery is low and with the car sitting with suspension components upgrades I’d like to get my trickle charger on it but not sure if I should engage the “normal” or “AGM” mode for the charger? I have what I think is the original battery it’s a Varta 8K0 915 105 F but I can’t find anything as to if it’s a conventional battery or an AGM and if there is a difference in the charging mode when on the 2amp setting ? Looking for anyone that would know if that part number (which seems to be an Audi part number) indicates AGM or not thanks

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**RockJGC** · 01-31-2023 12:13 PM

If it's the OEM battery, then it's AGM. But for charging, you'll be fine either way. AGM batteries like a bit more charging current, but they'll still charge in either setting.

**DrGER** · 01-31-2023 12:27 PM

Originally Posted by mrg_B8TFSi

... I have what I think is the original battery it’s a Varta 8K0 915 105 F but I can’t find anything as to if it’s a conventional battery or an AGM and if there is a difference in the charging mode when on the 2amp setting ? Looking for anyone that would know if that part number (which seems to be an Audi part number) indicates AGM or not thanks..

VAG part number 8K0 915 105 F is original spec for PR-J0Z (conventional flooded H9); this was in our '14 A4Q, too. See my VAG starter batteries guide here: https://www.vwvortex.com/threads/spe...codes.9490580/ --g

**Theiceman** · 01-31-2023 12:31 PM

yeah OEM is not always AGM , in fact its quite rare.. i think thats mine and not AGM...

yup thats the exact one i just replaced last month on my 14 non AGM.
i replaced it with a type 93 from costco

**Chillaxin** · 01-31-2023 02:15 PM

I went with the everstart platinum agm from walmart. Battery is made in Germany and other than the color/labels, it was exactly the same as the varta it replaced, for much less coin.

**Smac770** · 01-31-2023 02:31 PM

As noted, 8K0...F is H9 wet flood, not an AGM.

**mrg_B8TFSi** · 01-31-2023 04:13 PM

Originally Posted by Smac770

As noted, 8K0...F is H9 wet flood, not an AGM.

Thanks Smac.. I was 99% certain based on how it looked but was looking for expert opinion

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**RockJGC** · 02-02-2023 04:59 AM

Originally Posted by Theiceman

yeah OEM is not always AGM , in fact its quite rare.. i think thats mine and not AGM...

yup thats the exact one i just replaced last month on my 14 non AGM.
i replaced it with a type 93 from costco

Really? That's news to me. My 2011 and my 2016 both came with AGM from the factory.

**RockJGC** · 02-02-2023 05:01 AM

Originally Posted by mrg_B8TFSi

Thanks Smac.. I was 99% certain based on how it looked but was looking for expert opinion

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Just curious...how can you tell by looking at a battery if it's AGM or flooded? My AGM looks exactly the same as a flooded battery. The only AGM batteries that look different are spiral AGM like an Optima, for example. Non-spiral AGM don't look any different than a standard flooded battery.

**Smac770** · 02-02-2023 05:50 AM

AGM letters = AGM; EFB letters = EFB; no letters = wet flood.
black case = maybe AGM, maybe EFB; translucent/gray case = probably wet flood.
no sight glass = maybe anything; sight glass = wet flood.

If there's no identification on the battery which you can look up, there's pretty much no way to authoritatively confirm the chemistry inside.

Non-AGM in a black case - https://www.ebay.com/itm/191704012395
Image of a wet flood sight glass - https://www.ebay.com/itm/165053835616
Moll slaps a sticker over the sight glass, Varta does not - https://www.drive2.ru/l/548435851252597845/
a proper wet flood, translucent case, sight glass - https://www.interstatebatteries.com/products/mtp-95r/h9

So the correct answer? If it says AGM on it, it's AGM. Otherwise, look up the battery identification on the manufacture web site.

**Theiceman** · 02-02-2023 06:49 AM

Originally Posted by RockJGC

Really? That's news to me. My 2011 and my 2016 both came with AGM from the factory.

you did well :)

**bb-tt** · 02-02-2023 07:05 AM

stock battery in my 2011 (all depends on your pr codes)

**RockJGC** · 02-02-2023 07:28 AM

Originally Posted by Theiceman

you did well :)

Maybe I just got lucky. LOL

**Theiceman** · 02-02-2023 07:32 AM

Originally Posted by RockJGC

Maybe I just got lucky. LOL

as pointed out may have depended on your options, my 2014 flood, my friends 2010 Flood, and my other buddy not sure what year, flood. i was beginning to think AGM was a myth till you posted :)

**DrGER** · 02-02-2023 07:37 AM

Originally Posted by bb-tt

stock battery in my 2011 (all depends on your pr codes)

Thanks for sharing this image, bb-tt. Looks like PR-J0B. Battery manufactured by Johnson Controls. Note the production date coded on the (-) terminal. --g

**RockJGC** · 02-02-2023 07:38 AM

Originally Posted by Theiceman

as pointed out may have depended on your options, my 2014 flood, my friends 2010 Flood, and my other buddy not sure what year, flood. i was beginning to think AGM was a myth till you posted :)

Yeah....I always had the idea that an AGM is the better choice for any battery that's mounted inside the car, even if it's in the trunk. My Jeep has the battery mounted under the front passenger seat and it too is an AGM. Actually, it has two AGM batteries under the front seat. It's a strange set up for sure.

**Smac770** · 02-02-2023 10:51 AM

The wagons definitely seemed to get AGM more than the sedans. Like bb-tt, my 09 avant came with 4F0...E H8 AGM (J0B). While I remember several had posted their 3.2L 09 sedans coming with H9 flood (J0Z). I don't know any spec that loaded out with H9 AGM (J0P), other than it is defined. I suspect the electric tailgate is what pushed avants to AGM.

**mrg_B8TFSi** · 02-03-2023 09:55 AM

Originally Posted by DrGER

Thanks for sharing this image, bb-tt. Looks like PR-J0B. Battery manufactured by Johnson Controls. Note the production date coded on the (-) terminal. --g

I brought up this interesting topic because I have this exact physical battery in my 2013 B8 petro not flex fuel (I have plastic intake) CAEB 2.0Tfsi and the only difference I see on this battery is that mine is 8K0 915 105 F and this battery in image clearly shows AGM. I went to Varta website couldn’t find any reference from the part number with the physical construction of the battery.. I’m not here to say flooded over glass mat I really don’t have any preference as long as my battery is charging correctly and is coded properly. However for discussions and forums to say there is a physical difference between AGM and flooded acid batteries is incorrect as we are seeing the batteries look identical

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**Smac770** · 02-03-2023 01:07 PM

One says 4F0 915 105 E, one says 8K0 915 105 F. One is H8 size, one is H9 size. One has a black casing, one has a translucent casing. One says AGM, one does not. They are not identical.

**bb-tt** · 02-03-2023 01:10 PM

Originally Posted by Smac770

One says 4F0 915 105 E, one says 8K0 915 105 F. One is H8 size, one is H9 size. One has a black casing, one has a translucent casing. One says AGM, one does not. They are not identical.

such a stickler for the details