Battery Tender??

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Feb 4, 2012 | 03:08 PM

#11

Bigbottlebob

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Joined: Aug 2001

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From: Winterville, NC

Quote:

Originally Posted by uberwgn

No issues. They want you to connect to the charging points under the hood, not directly at the battery itself.

I've gone thru a couple of Battery Tenders and a couple of the Yuasa equivalents. They seem to range from 1A up to 1.5A in charging mode. The float charge is 10 mA for the Yuasa once the battery is topped off. I don't recall what the rate if for the Deltran unit

Most of these newer cars use an AGM type battery which is quite a bit better in terms of self-discharge compared to a traditional flooded battery. May not be much of a worry at all in terms of letting the car sit.

They make a cigarette lighter adapter as well, and since there is power to the socket, even with key "off" it will backfeed to the battery
without direct connection?
Easier than what I was thinking on the hard wire option. Just unplug and go. Will route the cable thru the steering wheel
so I don't forget it's there

Deltran's sales propaganda states that the Battery Tender Plus (which I have) has built in algorithm's that adjust charge depending on sensed battery condition and will work on Flooded and AGM applications. All technobabble to me.. but has worked fine for me in the past

In float mode, output is less than 10mA according to the specs.
so overcharge should not occur.

Feb 5, 2012 | 04:42 AM

#12

uberwgn

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From: Boston MA

Quote:

Originally Posted by Bigbottlebob

They make a cigarette lighter adapter as well, and since there is power to the socket, even with key "off" it will backfeed to the

I haven't seen those. Sounds like a handy adapter to have.

I connect at the under-hood ports:

B8 car >>

C6 car >>

Feb 5, 2012 | 09:38 AM

#13

jakematic

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Joined: Feb 2011

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From: NC USA

We don't have those on D3.

Quote:

Originally Posted by uberwgn

I connect at the under-hood ports

Jul 7, 2019 | 05:11 PM

#14

RickyJay52

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Joined: Mar 2019

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Quote:

Originally Posted by jakematic

We don't have those on D3.

Nothing like resurrecting a 7 year old thread! (Apologies if there are newer threads).

Where exactly do those of you who have a Battery Tender Plus attach it? There might come a time during the winter when I will not be driving my 2009 S8 for a few months at a time. Is a battery tender even necessary if I didn’t drive it for, say, 2 or more months?

Thanks.

Jul 7, 2019 | 05:58 PM

#15

ScottCNelson

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Joined: Oct 2004

Posts: 596

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From: Georgia

My S8

Quote:

Originally Posted by RickyJay52

Is On This Right Now. I connect to the battery Neg and the Pos post off the battery Management Controller as any charger should be connected. I use the ring-end harness that came with and route under the left compartment cover to qucik dissconnecr end and then to a 15 foot extension cable to the tender mounted in my carport. Can get pics in the daylight if you want.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

File:A8 charger hookup.jpg - Ross-Tech Wiki

Jul 7, 2019 | 07:24 PM

#16

RickyJay52

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Joined: Mar 2019

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Quote:

Originally Posted by ScottCNelson

A picture or two would be helpful, thank you Scott. I see your link is to a 5 Amp charger. Would my Battery Tender Plus @ 1.5 be adequate for the job?

Jul 8, 2019 | 04:29 AM

#17

ScottCNelson

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Joined: Oct 2004

Posts: 596

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From: Georgia

Size Matters

Quote:

Originally Posted by RickyJay52

A picture or two would be helpful, thank you Scott. I see your link is to a 5 Amp charger. Would my Battery Tender Plus @ 1.5 be adequate for the job?

If all you want is to keep a fully charged battery topped up, the 800 MA is enough. If you also want to be able to charge up a run down battery, get the 5 Amp.

Jul 8, 2019 | 05:58 AM

#18

ScottCNelson

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Joined: Oct 2004

Posts: 596

Likes: 25

From: Georgia

Pics

Quote:

Originally Posted by RickyJay52

A picture or two would be helpful, thank you Scott. I see your link is to a 5 Amp charger. Would my Battery Tender Plus @ 1.5 be adequate for the job?

Pics