I'm trying to be a responsible car owner but honestly I don't know what signs I should be looking for. I have a 2015 Kia Optima that still starts every time, no issues at all. But the battery is about two and a half years old now and I know that in Sharjah's heat, that's getting into the danger zone. I don't want to wait until I'm stuck in a parking lot somewhere with a dead battery, but I also don't want to replace a battery that still has life left in it. What are the actual warning signs that a battery is getting weak? Sometimes I feel like my headlights are a little dim when the car is idling, but then when I rev the engine they get brighter – is that normal or a sign of a battery or alternator problem? Also, my car seems to crank just a tiny bit slower in the mornings than it does after I've been driving, but it's such a small difference that I can't tell if I'm imagining it or not. A friend told me I can check car battery condition by looking at a little window on top of the battery that shows green for good and black for bad, but my battery doesn't have that window. Is there any other way for a regular person like me to test if my battery is still healthy without buying expensive tools? I've seen those cheap battery testers at the car accessory shop for like 50 dirhams, but do they actually work or are they a waste of money? Can a normal garage do a proper load test for free or cheap? I just want to know if I should replace my battery now or if I can safely get another six months out of it. I don't have a lot of extra money right now so I don't want to spend on a battery I don't need, but I also can't afford to miss work because my car won't start. Any practical advice from people who have learned how to predict battery failure would be really helpful. Please share what signs you look for and what testing methods actually work.