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post #1 of 28 (permalink) Old 01-08-2017, 12:34 PM Thread Starter
teo
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Battery dead

It was my fault. Left the key in on position for a few days came back the battery was dead. I usually park in the garage and leave the key on. There was only little power for the fade interior dome light. I put the neco intelligent cheger on, all the lights on the charger was flashing. Be aware if the battery level too low, those smart chargers are useless. I knocked my next door. He gave me a boost from his v6 pathfinder. First few tries did not work. After a few min waiting, the car worked. I drove around and came back, put the charger on. This time it recognized the battery and now charging. Lesson learn: make sure key is in off position if you leave it on the car And get a old school charger that works regardless. Would like to know what charger you guys use, brand amp etc. Thanks.

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post #2 of 28 (permalink) Old 01-08-2017, 12:40 PM
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I have a small Shumacher 6/2A charger that I use to trickle charge my boat battery over the winter. It will charge a dead battery, but it takes forever! I was always told never to leave the key in the "ON" position, because of the possibility of frying the electronics.
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post #3 of 28 (permalink) Old 01-08-2017, 12:42 PM Thread Starter
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Sorry when I said on, I meant accessory position.

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post #4 of 28 (permalink) Old 01-08-2017, 12:49 PM
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Quote:
Originally Posted by teo View Post
Sorry when I said on, I meant accessory position.

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OIC! No issues with that! I have done that before, too. But, never drained the battery.

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post #5 of 28 (permalink) Old 01-08-2017, 07:01 PM
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A reminder that if your battery is dead and the parking brake is on, you are boned until you get power back...

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post #6 of 28 (permalink) Old 01-08-2017, 08:23 PM Thread Starter
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That is exactly what happenned. The worst thing was my car was in the garage and becasue the auto brake was on, I could not back up to boost the car up in the driveway. My neighboor was cleaver and nice enough to remove his battery from his car and hook that up in the garage just to disable to brake. I tried to boost the car with his battery in the garage, it did not work. Then we pushed the car back into the driveway, he put the battery back into his car and gave me boost. So, I will definetely get an old school 3.5amp wall charger to prevent this happening. I also diabled auto brake permanently.

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post #7 of 28 (permalink) Old 01-08-2017, 08:47 PM
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Why in the world would you leave your key in the ignition in the accessory position for a FEW days?
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post #8 of 28 (permalink) Old 01-08-2017, 09:39 PM Thread Starter
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I was playing with the dash cam that I recently bought in the car. That is why.



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post #9 of 28 (permalink) Old 01-09-2017, 12:11 AM
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Quote:
Originally Posted by teo View Post
That is exactly what happenned. The worst thing was my car was in the garage and becasue the auto brake was on, I could not back up to boost the car up in the driveway. My neighboor was cleaver and nice enough to remove his battery from his car and hook that up in the garage just to disable to brake. I tried to boost the car with his battery in the garage, it did not work. Then we pushed the car back into the driveway, he put the battery back into his car and gave me boost. So, I will definetely get an old school 3.5amp wall charger to prevent this happening. I also diabled auto brake permanently.
What do you mean by an "old school 3.5amp wall charger" ? To me, "old school" chargers are not wall chargers, they are the old square metal box style chargers that usually do something like 2/5/10 Amps charging or whatever.

Smart chargers are designed to protect people from exploding batteries that are being charged with dead cells. So when voltage drops below a certain threshold, the charger refuses to deliver. Even older chargers won't recognize a battery if voltage drops way down, like to 2V.

The best way to attempt a charge on such a dead battery is to hook it up to another 12V battery, in parallel, until the voltage rises enough for a charger to kick on. And a small maintainer charger (like the little Nocos) is not designed to charge a discharged car battery, but rather to top them off and maintain. For deep discharge states, you need a bulk charge from a big charger first.
Some have been able to initiate a charge with an older charger, then hook up the smart charger once it sees the battery.

What your neighbor did there was give you a sufficient parallel hook-up charge from his battery (and alternator) so that the voltage on your battery rose enough to allow the small charger to operate.

A 3.5 Amp charger is too small to charge a drained battery, no matter what they may claim. Go for a smart charger that can go up to at least 10A, for typical car batteries. The small ones that produce less than 3.5A are to be used as maintainers, basically.

Your KL battery is an AGM battery, so it will likely survive this event with only minor internal damage. Try not to let this happen again, as you are already aware, because even deep cycle / AGM batteries suffer from deep discharge state..
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post #10 of 28 (permalink) Old 01-09-2017, 08:35 PM
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Leaving the key on runs down the battery, kills the coil, and burns the points depending on where the distributor is positioned. If the engine is started by hand crank, that's a different matter. Where am I?
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