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Message: <blockquote data-quote="jarance" data-source="post: 413339" data-attributes="member: 21">Questions:-1) How on earth did the car start with the lights permanently on the whole night?It not strange. The interior light does not consume much power. Lead acid battery can sometimes self re-generate if left unused for about 1 hour if there is sufficient charge. I have encountered that sometime the car cannot start with weak battery but after one hour I can crank and start the car after I shutdown all accessories and aircon.Call it luck, I dont know2) In connection to question 1), why, in the name of all that is holy and pure, did the car fail to start after only 20 minutes when I turned off the engine in Damansara Uptown?Maybe like what you say, the battery terminal is loose. When the termial is loose, you have a bad contact. Bad contact create high resistance. You need about 200 amp current to crank the starter and you are not going to do it if the battery contact are loose.When the car failed to start, I observed the following:-1) With the key in the ignition and turned on, all the normal lights were on ie: parking light, engine oil light, battery light etc. - this could mean that the battery is NOT flat.Loose battery terminal is the cause. The voltage is OK but the current is not OK for the starter which draws about 200 amp during cranking.2) During the jump start, the car failed to start via jump starting from the battery (from the car trunk). I could only start when connecting the cables to the front of the car (under the hood).Again, this have something to do with resistance. When jump start, not all the current is drawn from the other car battery. Your car battery also assist in contributing some current. As your battery is loose, power cannot drawn directly from your battery but have to rely solely from the other car. As the battery is located behind, you are looking at the resistance of the jumper wire and the resistance of the wire from rear (battery compartment) to the front of the car. The total resistance may sometime prevent the current from delivering to the starter.However, when I reached home, I noticed that the battery wires were loose. ARRGHHH I'm really confused!Dont be confused. Just re-tighten all terminals at the positive and negative terminals. Apply a thin layer of grease on the terminals to prevent white oxidation from forming after tightening. While you at it, check the acid level in the battery if you are using lead acid battery. Add distill water if the acid level is low.Moral of the story is Do regular maintenance to enjoy the car.  :top:or. In your case, have a car to follow you to jump start whenever you drive your car. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /></blockquote>

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