NHTSA Complaint #11590153 — 2019 NISSAN LEAF

During the last 3 winters I have noticed the car do something strange when going up an extended highway inclines. The battery % along with the estimated miles left will drop suddenly (~40% in a minute) and when I would go over the top of the hill most of the battery % and miles would return. During the 2021-2022 winter, I noticed this happen only once or twice. During 2022-2023 winter, I noticed this happen more often but I did not know what was causing it except it seemed to only happen on very cold days and also when the battery % prior to the drop was around 50% or less. During the current 2023-2024 winter, this issue became common. It no longer had to be very cold but just an extended incline and battery at 50% or less. It usually happened between exit [XXX] and exit [XXX] on [XXX] in New Jersey. It has become so common that I was able to record it. The videos show the car will lose over 40% of battery in about a minute. However, once I would go over the hill most of the battery % would come right back. In one video the “Battery charge is low Charge now” warning is triggered. On a few occasions, when I had around 30% of battery prior to going up this hill and the battery started to drop suddenly, I had to make a rapid emergency stop on the right shoulder midway up the hill. When stopped the battery would recover back to around 30% and I was able to get over the hill. This obviously created a safety concern. My car battery is still covered under Nissan’s EV battery warranty. I have taken the car to two 2 Nissan dealerships. One of the dealership was able to replicate the issue, but stated the only way they will approve the warranty repair is if they disassembles the battery. They stated once they approve the warranty repair they can order the battery but that it might take up to 8-9 months to get the battery. They stated that during this whole time my car will be inoperable and Nissan will not provide or reimburse for a loaner car. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.