I've got a 2019 Nissan Armada that I use for family trips and weekend getaways, and overall it's been a fantastic vehicle, but I've noticed something weird with the battery over the past few months that's been bugging me. Whenever I'm sitting in the car with the engine idling and the AC running full blast, especially when I'm waiting to pick up the kids from school, I can see the voltage gauge dropping pretty noticeably, and I've even had a couple of instances where the car struggled to start right after I'd been idling for 15-20 minutes with the AC on. I've had the battery tested and it's an 80D26L that's about 18 months old, and the shop said it was still in decent condition, but I'm wondering if the AC compressor is drawing so much current that it's putting a strain on the battery, or if there might be something else going on with the charging system. I've read that these big V8s have high-output alternators that should be able to handle the load, but I'm not sure if the alternator is working at full efficiency when the engine is just idling, or if the battery is just getting weak and can't handle the extra draw. A friend of mine who drives a similar Armada said he had a similar issue and it turned out to be a faulty voltage regulator that wasn't allowing the alternator to charge properly at low RPMs, which is exactly what I'm experiencing. The thing is, I don't want to replace the battery if the alternator is the real problem, because that would just be throwing money away. I live near Al Manara and I've been looking for a shop that can actually test the whole charging system properly rather than just throwing a multimeter on the battery and calling it a day. I've heard about a place that offers Capable 80D26L Battery Replacement Al Manara and apparently they do a full electrical system diagnostic to figure out if the issue is the battery, the alternator, or something else entirely. Has anyone here experienced a similar issue with their Armada or similar Nissan SUV where the battery drains quickly with the AC on, and did you ever figure out what the root cause was? I'd really appreciate some advice because this has been driving me crazy and I want to get it sorted before the really hot weather hits and I'm stuck idling in traffic even more than usual.