Monday morning I went out to the garage, and reached over to open the door of the Focus. The door is supposed to auto unlock, and it did not. Fortunately, I was prepared for this problem. I read before I purchased it that the 12v battery is needed to turn the engine on and run the car. I took the key out of the fob, opened the door, the hood and put the multimeter on the battery. 3.5 volts. So I call the local Ford dealer, and I walk him through my problem and make sure it's ok to put the charger on it. They told me it's fine. As soon as I turn it on, do a relay fires, and the battery tender shuts down. So I disconnect the battery, charge it up, less than 5 minutes later the charger shuts off. It's at 11.8v. I figure that's enough to get it going. As soon as the cable is on the battery, the relay fires again, and I hear the battery cooling system clunk like it always does. I let it sit for a minute, the car still won't boot, and the multimeter says 5.6v. So obviously the relay is draining the battery when the car is parked.
It's been sitting a lot the last few weeks. It was in the shop for paint work due to an incident with an agile post. After which, the weather was good and we've been riding the scooters around. So over about 4 weeks it was charged once. This allowed the 12v to deplete. The way it charges and depletes makes me think it has a bad cell. I called the dealer back, told them my experience with the battery, and they agreed that the battery should be replaced. I try to make an appointment, but since my car is under warranty, the car needs to be taken to one of a specific few dealers that have Electric certified mechanics, because Hybrid certification isn't good enough to change my battery.
So I charged the battery enough to boot the car, and then plugged it into the wall. The on board charge will charge the 12v, so I left it overnight. The battery is at 13.8 and holding, but I'm just going to buy a battery myself. Warranties are s***.
