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Thread: batteries left in chargers
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8th April 2014, 02:31 PM #1
batteries left in chargers
is it ok to leave batteries [nicd / l ion] in their charging units with power applied after they are fully charged?
often i will forget one and it might sit there for a few daysray c
dunno what's more fun, buyin' the tools or usin' em'
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8th April 2014, 02:45 PM #2SENIOR MEMBER
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A very general rule is : nicd no, lion yes.
This site might be useful.
http://batteryuniversity.com/learn/a..._battery_table
I have always worked with - It depends on the charger, the battery type and the device being charged.
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8th April 2014, 03:50 PM #3New Member
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Another way to check is to see if your charger is labeled as a 'smart charger'.
My understanding is that they are called 'smart' because those models are able to tell when the battery has been charged, and so they will either stop charging, or they will run a break-in cycle, or a maintenance cycle. This is particularly with regard to new model Lithium Ion batteries.
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8th April 2014, 04:47 PM #4Retro Phrenologist
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One of the biggest battery killers is heat. If your battery is still hot after a couple of days in the charger you are probably shortening its life span.
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there are only 10 types of people in the world. Those that understand binary arithmetic and those that don't.
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1st June 2014, 11:43 PM #5
this depends on the charger and the battery.
crude simple NiCad chargers have no end charge sensing and just continue to apply current untill the battery is removed.......leaving batteries in this type of charge will kill the battery in short order.
the slightly more sofisticated NiCad chargers ( like th old 7.2 and 9.6 volt makitas have a heat sensor in the pack...when the battery is fully charged the battery heats up, te sensor triggers a circuit in the charger and the charge current is removed.......these chargers will have 3 tereminals on the battery and a charge light that goes out.....leaving batteries in these chargers is fine.
then there are the smart chargers ( whatever that means) these have some sort of multi stage circuit with multiple indicator lights.....these also should be fine left in the charger.
Lithoum batteries in general must have some sort of charge termination in the charger otherwise they will burn or explode.
cheersAny thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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3rd June 2014, 05:52 AM #6Member
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The longer Lithium type chemistry stay fully charged(4.2v per cell) the faster the cells deteriorate. For a happy long life Lithium pack, don't let it sit fully charged for extended period of time.
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