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!