From the looks of it, it is very likely that the lights being left on drained the battery just enough to prevent the starter from doing its job. So it should be able to start again. However, no car battery, however powerful, can last forever. First of all, it’s advised that you wear safety gear, including both gloves and eye protection when charging a battery still connected to a vehicle. Since the car started, then the battery should be fine., correct? However, a weak battery is likely to drain completely within a few hours, according to Cars Direct. If the voltage is not within certain parameters, the light goes on. Car Battery Died (left lights on). If so that's your culprit. Other functions that drain the battery if left on include the car radio, headlights and trunk light. Charging a car battery while still connected can have unexpected consequences There are a few simple steps you can take to make sure you’re charging your battery safely. Then, I drove to work, which takes about 20 minutes. When you recharge a dead car battery, it’s very helpful to know just how dead it is before you decide how you’re going to deal with it. Ideally, the battery should be charged off the car, but if the battery has no damaged cells, it can be charged in the vehicle as well. Check the water levels in a car battery to determine whether or not the battery is ready to be replaced. 2) I heard that driving the car recharges the battery… Today, most cars have a single maintenance-free 12-volt acid battery (in the photo). It started fine in the morning. Can't get a jump either. https://www.liveabout.com/how-to-revive-a-dead-car-battery-4155742 Your local automotive shop is more than able to load test your battery for … But as this is a new battery I am interested in doing a proper recharge with a battery recharger for a couple of days. i have a 2004 prius. In this guide, you will find instructions on how to charge a dead BMW battery. So, my car battery died 4 months ago while it was unused in my garage during the summer (interior dome light left on for months). Post by oneleaf » Tue Apr 13, 2010 2:15 am. Find out how below. apparently, i left the lights on for 2 weeks. If you turn the key and the car's completely dead, check to see if any lights have been left on. In that way, you will end up operating the battery at or near a state of discharge, which risks further sulfation. Even if you jump start as a quick fix, it's a good idea to look into charging a car battery properly to keep it in good condition. The nature of charging your phone in your car poses a risk to your phone. now it is hard to even turn off--maybe because the battery is so low. 03-20-2013, 01:42 PM #2. So we jumpstarted and drove for 40 minutes. The main function of a car battery is to start your car. Once your car is jumped it shouldn’t die again. ... Once your engine is running the alternator will recharge the battery back to full but you need an additional charge. Even if you drive it for a long time and keep the engine revved up, it is extremely unlikely that you will be able to fully charge the battery like that. A strong battery is likely to die if the dome light is left on overnight. I left the trunk of my Forte sedan overnight accidentally. 21 years of experience. For a short time, your car will continue to function solely on the charge left in the battery. Automotive Mechanic. Turn off the vehicle with the good battery. The "self-recharging" features of batteries is most noticeable in a car battery. Battery problems - Your battery/check charging system light could be coming on because your battery is low and needs replacing. This forces the system to keep charging the battery, the same as the rest of the reliable cars on the road do with or without their lights on. Have your mechanic test the voltage coming from your alternator. I left the lights on at the airport once and drained the aux battery on our '03HCH. This is a likely solu t ion to your problem if you left your lights on overnight and is the easiest solution. The higher the drain on the battery (a car's starter motor is an … The most common problem in this case is a faulty or loosened alternator belt, but it might also be possible for the alternator to fail. Can't give you technical answer, only one based on my experience but the answer seems to be It depends on the condition of your battery and what you leave on as some things use more battery than others. Oh no! It powers everything, from the engine to the headlights of your vehicle, and is, therefore, an essential part of your car. It 's so dead battery 's charge if you turn the key the! Going but the toughest thing i found was getting the radio code cases a simple jumpstart the. 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