The battery tender sold at Parts Rack has 2 cables that are detachable. One is a cable with 2 clamps on it for direct connect to battery terminals, the other is a cable with 2 0 ring attachments. Basically you run the one O ring to the ground and the other to the post under the hood. Run the connecting wire down by the ECU so you have a place to tuck it away during normal driving and you have an easy way to hook up to a tender without opening the hood. Been doing this for 2 years now.
