Our 2015 Subaru Outback has had 4 batteries in 4 years. After some research, a parasitic battery drain issue is common with this year Outback and other Subaru models. Some sites call out the Subaru CAN network as the culprit. Whatever the case, we have had the car to Subaru who changed firmware ostensibly to provide more charging at lower rpm. After that software change was made the problem has apparently gotten worse. Now the car's battery will drain in 2 days of use (the current battery is 4 weeks old). There are numerous complaints about this on line and the common opinion is that Subaru is not addressing the issue.

- Ashburn, VA, USA

There is some kind of electrical malfunction or drainage that the battery drains even when car is turned off. Replacement of new battery results in the same problem after a few days

- Lexington, MA, USA

The car regularly drains the battery. We are the original owners and have had to purchase 3 car batteries thus far. The car does not provide any warning messages or report any issues. Every time the battery has been drained it happens without explanation, over a dozen times since we-??ve owned the car. We-??ve always had the batteries inspected, and they-??ve been in good contention with life left in them, just drained, needing a recharge. Unfortunately, the car counties to drain the battery, leaving me stranded, including at night away from home. The details for the incident I will be providing below will be for the most recent, this morning.

- West Sacramento , CA, USA

Battery drain over night, dead battery in the morning. Alternator output normal, terminal post clean and battery will charge with external charger. Battery is less than 2 year old

- Hermon, ME, USA

The battery has gone completely dead 3 times over 6 years since I purchased this car new. The battery dies, like clockwork, every 2 years. I have purchased 2 new replacement batteries so far on 5/16/2017 (mileage 25,895) and 2/5/2019 (mileage 40,017). The third instance just occurred 1/5/2021 and I have not yet had a chance to take the car to a shop to determine whether the current jump-started battery will reliably hold a charge. Clearly, there is a problem in the Subaru electical system causing a constant drain on their batteries. A quick internet search uncovers that this has been a common occurrence among many Subaru owners over several model years.

- Bethesda, MD, USA

Battery repeatedly fails every 2 years since new vehicle purchased. New vehicle purchased in 2015, had to replace battery in 2017 and replaced again in 2019. It is now Jan 2022 and battery had insufficient charge to start car. I have now had to purchase a $110 battery charger to hopefully maintain the charge on my battery. There were no accessories left on or other unusual circumstances that would cause the battery to drain. The vehicle is driven regularly and kept in a garage. There appears to be an ongoing problem with the vehicle routinely prematurely draining the battery over time.

- Bethesda, MD, USA

On four occasions over the past five months my car needed a jump start for no apparent reason. I had a new Subaru battery installed last July, and a check up at a Subaru dealer last month which found no problems with the battery or alternator. I recently read about a battery drainage problem that other owners of this model have been experiencing as well.

- Los Angeles, CA, USA

Repeated dead batteries. Replaced OEM battery in year 2, new battery also comes up dead regularly. There is clearly a parasitic battery drain happening. Burning oil, this car burns more oil than any car I have ever owned. Subaru claims it is within specification, but their specification is 1 quart between changes, this is a ridiculous claim in 2021. Heat shield and exhaust noise. Always a new noise or exhaust leak. Lights are not adequate for country driving, it is dangerous.

- Fennville, MI, USA

Our car has electrical / battery problems. It frequently will not start on its own. We have to jump start the battery about once a month, sometimes more frequently. The primary driver commutes 120 miles at least once a week (60 miles each way), thus we should not have issues with battery drain, but we do. We replaced the battery 1 year ago and the problem still remains. The battery also drains quite quickly, for example, last week we had the back lift gate open for 15 - 20 minutes while we were in and out of the house packing up the car with all the things I needed for a work event. When we were ready to go, the car wouldn't start. This has happened to us multiple times camping in the past. Because we have had so many problems with our car starting, we keep a small battery generator charged and in the car so we can jumpstart our car if needed. Without this device, we would have been stranded in the back country tens of miles away from civilization with no cell service and no ability to get home. We've started keeping all the lights off inside the car to see if that helps, It hasn't, even with no lights on inside the car the battery has drained while packing up our car for a trip. The dealership replaced the battery in 2020 and said that was the problem, they have not looked for "parasitic drain" despite our complaints. There is no warning when this will happen, no lights appear or messages. This has been an ongoing problem that started in 2019 that continues to this day. Our safety has been put at risk multiple times with this problem by potentially leaving us completely stranded in the woods, at night in urban environments, and has prevented us from getting to work on time. I've read on numerous forums that this has been a problem with the CANs systems in this model. Please investigate.

- Albuquerque, NM, USA

My 2015 Subaru Outback has continually experienced random battery drain. I have replaced the battery 3 times since purchasing the car from a dealership in 2017. In all cases, there was no advanced warning indicating that the battery was low, the car had been driven regularly with an average amount of mileage and no lights were left on nor was there extreme weather. Most recently (11/7/2021) the tailgate was up with the car off for 30-45 minutes. It was jump started, we made it home and the next morning it had zero power. That last battery was purchased in April of 2021. The car is regularly maintained by the dealer and/or a certified mechanic.

- Malvern, PA, USA

On multiple occasions the battery completely dies over night for no apparent reason and with no warning. Nothing that draws power was left on. This is a hazard as we can be stuck someplace with no way to start our car. The battery and alternator always check out as normal (by local mechanic), yet it keeps dying to the point that there are no dash lights, horn, emergency blinker or anything else functioning. Most recently I can't even jump start the Outback. Some design defect, (electronic/ computer) is causing the vehicles' battery to drain quickly which renders the car inoperable.

- Sherwood, OR, USA

This car has repeatedly drained the battery when completely off. I have replaced the battery thinking it was a faulty battery, only to have this occur repeatedly with a new battery. I am certain the doors are shut, lights are off, car is off and locked and nothing I have left on is in anyway draining the battery. I have even experienced this when driving the car for an hour, parking it for 30 minutes and coming back to a dead battery. The battery drops to 5v and car won-??t start. The battery does charge and holds 13.5v. This is not an error with the battery as I have replaced the battery.

- East Hampton, NY, USA

I have had to change my car battery three times in four years. A couple times it seemed like my battery went bad soon after having service on my car even though my battery tested okay and given a green symbol. The last date I had to replace the battery is below.

- Baton Rouge, LA, USA

Bought 2016 model December 29, 2015. Battery consistently drains. It has had at least 3 replacement batteries in 5 years. Car has less than 46k miles on it. Had to get jump started twice within a two week period, with a battery from February of 2020. Battery issues 3/2018 26k miles 2/2020 37k miles 8/2021 45k miles 9/2021 45k miles

- Charleston, SC, USA

i will be purchasing my 4th battery, this seems to be an issue people are having with this 2015 outback. I maintain my car and garage store it and I continue to have dead batteries that need to be replaced, I am not leaving any interior or exterior lights on either.

- Needham, MA, USA

I have to replace my battery 1-2 x year, possibly due to Parasitic draw. No lights have been left on, nor anything electrical when the car is shut off. Between batteries, I often have to jump my car to start it. I have been stranded places and I am in constant fear my car will not start.

- Seattle, WA, USA

My vehicle was purchased in September 2014. Approximately the night of March 9, 2017 my daughter apparently turned on a dome light, which remained on the rest of the night. My car had approximately 45k miles on it. The next day I attempted to start the car, nothing happened. The battery was so dead that even connecting to another vehicle for 20 minutes resulted in no change. I purchased a new battery on 3/10/2017. On 7/10/2021 with approximately 100,000 miles I was at an airport for pickup. I turned my car off upon arrival and waited for 30 - 40 minutes with the key in the ignition. I think that resulted in some lights remaining on. When I attempted to start my car to depart the airport it gave an indication of attempting to start but there was not enough power to facilitate the action. I needed to briefly connect my car to another for enough power to start the vehicle, which has run apparently fine since. Now I have to be vigilant to ensure no internal lights are on for more than a few minutes regardless of situation. Recently I read this article, https://www.motorbiscuit.com/dead-batteries-new-subaru-lawsuit-claims-least-five-models-defective-batteries/, which seems to be the situation I am in. It seems that two batteries in a period of 7 years and approximately 102,000 miles seems a bit excessive. A non-technical analysis leads me to think either Subaru is not putting an adequate power supply in at least their Outbacks, maybe other models based on at least the linked article, or something is wrong with the electrical management system resulting in drains on the battery resulting in significantly shorter battery life than found on other vehicles, which results in additional cost to consumers to replace batteries assuming they die at a convenient time and other costs are not incurred.

- Westminster, MD, USA

Bought this car used with low miles in 2019 from a Subaru dealership. We have had intermittent issues dating back to late 2019, where returning to the car find that the battery is dead when we went to start it. It usually happens when the vehicle was left for 4 hours or more, although not always. After reading several reports of the same issue, we are going to try a new, larger battery.

- Monroe, WA, USA

I have a parasitic drain on my battery and I have replaced the battery 3 times. It seems my battery is not the issue, but I am constantly stranded on the road and the dealership just replaces the battery. This last replacement I did at a separate shop on 5/10/2021 because my battery needed to be replaced and I thought putting in a different battery would help. Today (7/21/2021), my car will not start again. This shouldn't happen with a new battery and I don't think it's right that Subaru is not doing anything about this issue. It started happening within the first 3 years I owned this vehicle, when it was under warranty. Their solution was to replace the battery and not actually fix the real issue. This is not okay. I drive this car regularly and there is no reason why my battery should die constantly.

- Happy Valley, OR, USA

On 4 occasions the car battery has unexpectedly gone so low that it could not be started. On the second occasion (January 2022) the battery was replaced. On the third occasion (July 14, 2021) the battery was again replaced. On the fourth occasion (July 18, 2021) the battery was completely dead. It was necessary to use a mechanical key to enter the vehicle so that the hood could be raised. The battery has been recharged and a report will be made to the dealer for the second time tomorrow.

- Manhattan Beach, CA, USA