What's the extra oval hole for?

 

3 pin is for a HD 5 amp charger. The 2 pin is for the HD tender.

 

Good to know. I bought a battery tender and added the cables myself, not realizing there was one hidden behind the side cover. Discovered that one in the pic when I was running power for an amp and flipping through the manual to figure out what it was. Since it was slightly different sized I was afraid to use it still!

 

Hey Cryptoboy here's a suggestion, go to the NOCO website and purchase the GBC 009 battery harness with an SAE adapter for your tender. Also pick up a HOG Booster Portable Battery Pack, p/n 66000130. The pack is actually a NOCO booster pack, 1000 amps starting. Also has a recharging cord and jumper cables with clamps that actually fit on a motorcycle. You can plug the pack into the harness to jump start your bike or a buddy can use your pack to jump start his/hers. The best of both worlds.

 

i have this noco booster pack for over a year now... finally used it last week to jump my wifes highlander v6.. batt was completely dead... this little thing is crazy cool... carry it on my bike mostly but now on our car trips too... just wondering if it should be charged up every few months even if it's not used... seems to always show fully charged