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Connecting battery tender to battery cables? #5433842 05/20/20 04:42 AM
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dlundblad Offline OP
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Would there be any issues with connecting a battery tender to the battery cables at the starter and ground as opposed to the battery posts themselves?

Last edited by dlundblad; 05/20/20 04:42 AM.

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Re: Connecting battery tender to battery cables? [Re: dlundblad] #5433848 05/20/20 05:05 AM
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Should be just fine.


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Re: Connecting battery tender to battery cables? [Re: dlundblad] #5433880 05/20/20 06:30 AM
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Astro14 Offline
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If the connections are clean and tight, probably not, but any extra resistance will mess up the measurement of voltage, and hence, charging.


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Re: Connecting battery tender to battery cables? [Re: dlundblad] #5434032 05/20/20 10:37 AM
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No. Just make sure it is a constant hot direct connection.

I used the main connection to a distribution/fuse box underhood on my truck out of convenience (side terminals). My BMW has the battery in the trunk, but I connected the charger leads underhood to the main cables. It has worked great for years.

Re: Connecting battery tender to battery cables? [Re: dlundblad] #5434052 05/20/20 10:56 AM
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joekingcorvette Offline
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No problem. My 2014 has the battery underneath the passenger seat however there are posts under the hood to hook up cables if needed. I never had to mess with it.


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Re: Connecting battery tender to battery cables? [Re: dlundblad] #5434068 05/20/20 11:25 AM
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Dave9 Offline
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No but if that's going to be a pain to get access to, then I'd run wire to make a remote access point where it is more convenient, and for low maintenance level current, I'd consider using a DC barrel jack/plug combo instead of a clamp to post setup.

Re: Connecting battery tender to battery cables? [Re: dlundblad] #5434212 05/20/20 02:11 PM
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DBMaster Offline
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I added length to the two wires on one of these connectors and connected them to the battery posts. I have the connector tucked behind one of the vertical grill supports on the bumper. It's out of sight until I reach in and pull it out. It connects directly to the Battery Minder charger/desulfator I use. After "restoring" a three year old battery that was weak enough to be replaced I started connecting the charger to it any time I wasn't using the car. Now, I just connect it once a week. Nine months later the battery still reads 12.7V and does not drop below 11V when starting the car. The desulfation process is very slow, but I've read about batteries lasting at least double their normal lives by doing this. Some of those anecdotes were from this site.

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Re: Connecting battery tender to battery cables? [Re: Astro14] #5434753 05/21/20 04:08 AM
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dlundblad Offline OP
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Originally Posted by Astro14
If the connections are clean and tight, probably not, but any extra resistance will mess up the measurement of voltage, and hence, charging.


Ouch. So this would definitely be a no go on a car with the battery in the trunk like a P2 Volvo then?


03 Jeep WJ 4.0 208k
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Re: Connecting battery tender to battery cables? [Re: dlundblad] #5434890 05/21/20 08:35 AM
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I’ve got the cables on three cars, the 2001 V70, the 2002 V70 and the S600.

All three have the battery in the trunk. I attached the ring connectors to the battery clamps. No resistance. No loss.

I’ve got to back the car into the driveway to make the connection. But they work great.

I wouldn’t connect the ring connectors to the jump points under the hood. I think the Battery Tender directions tell you to connect directly to the battery.


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Re: Connecting battery tender to battery cables? [Re: Astro14] #5434953 05/21/20 09:47 AM
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dlundblad Offline OP
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Originally Posted by Astro14
I’ve got the cables on three cars, the 2001 V70, the 2002 V70 and the S600.

All three have the battery in the trunk. I attached the ring connectors to the battery clamps. No resistance. No loss.

I’ve got to back the car into the driveway to make the connection. But they work great.

I wouldn’t connect the ring connectors to the jump points under the hood. I think the Battery Tender directions tell you to connect directly to the battery.


Do you shut the tender wire in the trunk or just go through the battery vent hole?


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02 Volvo S60 2.4T 199k
97 Chevy Blazer 4.3 175k
04 Audi A4 3.0 210k

Re: Connecting battery tender to battery cables? [Re: Astro14] #5435052 05/21/20 11:51 AM
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Originally Posted by Astro14
I’ve got the cables on three cars, the 2001 V70, the 2002 V70 and the S600.

All three have the battery in the trunk. I attached the ring connectors to the battery clamps. No resistance. No loss.

I’ve got to back the car into the driveway to make the connection. But they work great.

I wouldn’t connect the ring connectors to the jump points under the hood. I think the Battery Tender directions tell you to connect directly to the battery.


They generally say to connect the negative to chassis, positive to battery.

As none of these are charging at appreciable rates, the resistive drop is sufficiently low that the conductor length doesnt matter much. One of the reasons to connect to the battery is because it wont work if connected to a switched source. BMW sold a trickly charger that went through the cigarette lighter port - it was a relabeled battery tender!

Re: Connecting battery tender to battery cables? [Re: dlundblad] #5435084 05/21/20 12:45 PM
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Astro14 Offline
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I close the trunk/hatch on the battery tender cable. It’s an extension cable, relatively thin gauge, and easily replaceable. No gasket damage from that thin cable.


32 Packard 15W40
01 Volvo V70 T5 0W30 AMSOIL SS
02 Volvo V70 T5 0W30 Edge
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Pennzoil Ultra
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