My 12V battery decided to drain itself again for some reason. It has happen at random a handful of times over 3 years. Yes I have the 3-g telematic update. It's very annoying. Fortuitously it has always been at home and never caused me an issue. LEAF is a 2nd Car....
Solution: I connected direct to battery (with a 5 amp inline fuse) and routed it to the nose hatch to charge the battery w/o popping the hood. There is a gap in the corner. So wire routing is easy. The connector is a FLAT 2 POLL connector similar to utility trailer. It connects to an extension, to a trickle charger. I measured current when charging. It drew about 1/2 Amp when charging a partially drained (60%) battery. Obvious advantage is not having to pop hood and clip onto battery. I hope this does not cause an issue if charging the battery while charging the drive battery pack.
Solution: Also I monitor the battery voltage. I NOW[ have a battery monitor in the Lighter Socket. I can keep an eye on it when driving. No surprise battery is always under charged or in low charge state. Typical volts I see driving around is 12.8 to 13.1 volts, basically nominal charge of battery. In ICE cars their electrical system typically is at 13.8 to 14.5 volts.
- If it works (I use it) I will put a hard mounted receptacle so I don't have to use two hands to plug in and unplug.
- I may move the connector to the lower side grill so I can plug battery charger in without opening the nose charge door.