FusionChamberMD Posted November 10, 2020 at 11:29 PM Report Share Posted November 10, 2020 at 11:29 PM 2015 Fusion Energi MAIN battery was fully charged. Due to COVID-19, didn't drive the car for over a month. Went to drive it, the car was dead, no power at all. So I jumped the TRADITIONAL battery from our other car, got everything working again. Drove the car just a little bit, using main battery power only. Got main battery down to about 80%, and when I plugged it in that night it wouldn't recharge. So today I drove it so that the main battery was completely discharged, and plugged it in again. Have tried both power cords that I have. Both are receiving power from the outlet, and both display that they are relaying the charge to the car. However, while the light up quadrants around the car's charging plug in port do their usual flashing sequence, and the first quadrant starts the slow flashing indicating it's beginning to take a charge (and I hear the main battery start to hum like usual), after just a few seconds the light up quadrant goes dark and the battery goes quiet. Did something about running down the traditional battery ruin the main battery's capability to take a charge? Anyone else dealt with this before? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
murphy Posted November 11, 2020 at 11:56 AM Report Share Posted November 11, 2020 at 11:56 AM Your 12 volt battery needs to be replaced. Without 12 volts to pull in the contactors the HVB is disconnected from the car. When a wet cell lead acid battery is completely discharged lead flakes off of the plates and accumulates at the bottom of the cell. That is permanent damage to the battery. Use a real battery charger, not a maintainer, to fully charge the 12 volt battery at high current to see if it will hold a charge. The car will not allow the HVB to be completely discharged. When it shows 0 that is only the electric drive portion. The hybrid portion (1.5 kWh) and the protection portion (0.5 kWh) are still charged. Quote Link to comment Share on other sites More sharing options...
jsamp Posted November 12, 2020 at 05:00 AM Report Share Posted November 12, 2020 at 05:00 AM On 11/10/2020 at 3:29 PM, FusionChamberMD said: However, while the light up quadrants around the car's charging plug in port do their usual flashing sequence, and the first quadrant starts the slow flashing indicating it's beginning to take a charge (and I hear the main battery start to hum like usual), after just a few seconds the light up quadrant goes dark and the battery goes quiet. I assume you don't have any "Value Charge" profiles active? That would explain the 1st quadrant initially indicating charging, only to go out moments later. That said, the age of your car and issue you saw with the 12V battery being dead once indicate that it is time to replace it. I just replaced mine in my 2015 as well. If you think you'll keep the car a long time, you may want to invest in an AGM battery that is better suited to the Energi. Quote Link to comment Share on other sites More sharing options...
FusionChamberMD Posted November 12, 2020 at 10:56 AM Author Report Share Posted November 12, 2020 at 10:56 AM I assume you don't have any "Value Charge" profiles active? Well shoot, now I feel like an idiot. I've never used that feature, but I checked it and it was activated--probably because everything reset when I charged the battery. I turned off the value charge and everything worked normally. Thanks so much for pointing this out--and I will keep an eye on the 12V for replacement. Quote Link to comment Share on other sites More sharing options...
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