will my flashlight kill my battery - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 06-14-2007
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will my flashlight kill my battery

if i leave my mag light plugged in over night will it kill my battery?
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  #2  
Old 06-14-2007
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Not if your battery is in good shape. Leaving it plugged in all time, assuming you start and use the truck everyday or every other day, you'll be fine.
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Old 06-14-2007
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once its charged it wont be pulling any more power so you should be ok
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Old 06-14-2007
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i think it should be ok.
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  #5  
Old 06-16-2007
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cool thanks ill test it when i get a few days off work and dont realy have to worry about the battery failing on me thanks
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  #6  
Old 06-16-2007
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I had my maglite wired so the charger had power all the time. I never noticed any problems. Even when the truck started sitting for about a week without being run, it would start fine so don't worry about it at all.
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  #7  
Old 06-16-2007
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I would agree that if it's a fresh battery, you will be fine. I am not familiar with the maglite charger, but I highly doubt it's a float charger or smart charger. For anyone who does not know what a float charger is, it is a charger that applies charge until it reaches full charge and then cuts off until the self discharge has dropped the voltage down to a preset minimum.

The technology in these style chargers is not too complex however it drives cost up considerably. To give you an idea, Laptops don't even come with float chargers.

So while your car battery may be fine to take the minimal drain in between cranks, you are actually harming the maglite battery. you will get about half the possible lifetime. If it's more important to always have it charged and ready to go, then don't change your habits. However if you want the longest lifetime out of it, only charge it after almost completely depleting the charge. And only charge it for 3-4 hours MAX.
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  #8  
Old 06-16-2007
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Quote:
Originally Posted by KARPE
The technology in these style chargers is not too complex however it drives cost up considerably. To give you an idea, Laptops don't even come with float chargers.
Laptop batteries are LiIon. They require a special sequence of a constant current, followed by a constant voltage until fully charged, and the chargers will then shut down. There are also special charging algorithms that allow the battery to discharge to a certain level before recharging (Lenovo/IBM). Holding a full charge for a long period of time will reduce the life of a LiIon battery.
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Old 06-16-2007
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you will be fine.. it isnt kc lights your leaving on here... btw dont ever do that lol
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  #10  
Old 06-16-2007
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Quote:
Originally Posted by Takeda
Laptop batteries are LiIon. They require a special sequence of a constant current, followed by a constant voltage until fully charged, and the chargers will then shut down. There are also special charging algorithms that allow the battery to discharge to a certain level before recharging (Lenovo/IBM). Holding a full charge for a long period of time will reduce the life of a LiIon battery.
this may be very recently that IBM chargers cut off, but I see first hand everyday the result of leaving laptops plugged into AC power round the clock.

All I'm saying is that most manufacturers will not opt for the higher cost in producing a charger, so it is safer to assume responsibility when charging than to leave any battery on a charger continually.
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  #11  
Old 06-16-2007
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Quote:
Originally Posted by KARPE
this may be very recently that IBM chargers cut off, but I see first hand everyday the result of leaving laptops plugged into AC power round the clock.
.

What brand? I have never seen a laptop with LiIon batteries not have a charger like I described with the Lenovo / IBM laptops. This has been the
case with even the old Model 600 Thinkpads!! Matter of fact, this circuitry
is built into the LiIon batteries!!
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