Normalself discharge according to Battery University is 5% per month. But at 80 F another source says 4% per week. One other point, the C-Max battery capacity is about 43 Ah when new. The fact that it's 21 months old means it's lost some capacity and cannot be charged to 43 Ah.
Thebattery location in a Ford C-Max can typically be found in the engine bay, but may be in the trunk, fender or inside of the vehicle. You may need to remove the air filter housing, a plastic engine cover or parts of the cowl to find the battery in your C-Max. See exactly where the battery is located in your 2013 Ford C-Max. Replacing the
Showingthe 2013 Ford C-Max Energi 5dr HB SEL Interior Charcoal Black Taupe / Pearl Beige $1,440 Starting MSRP $0 Starting MSRP $3,080 Starting MSRP followthese steps to open your Ford C-Max trunk when the battery is dead: Locate the manual release lever inside the car. It is usually near the trunk. 2. Pull the lever to open the trunk. 3. If the battery is completely dead, you may need to use a jumper cable to start the car. Once the car is started, the trunk will open.

HiEveryone, here is the process to upgrade the OEM 12V battery which is a group 67R with 390 CCA to a group 96R battery that has 600 CCA. The battery is on

Home Ford C-MAX Hybrid Powertrain Forum. Batteries. First off, a little background information: I have a 2013 Ford C-max SE and have had three dead battery events. They have always occurred when the car sat overnight. We make a point of making sure that nothing is left on or plugged in. We even make sure the keys are taken out of EbKIL.
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    • 2013 ford c max battery size