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Tool Talk Discussion Forum

Power tool battery

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john-mi

03-25-2020 18:02:59




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Can you charge a power tool battery off a pickup battery to get by until my charger gets repaired?




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BarnyardEngineering

03-26-2020 07:07:08




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
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Depends. What voltage and what type of battery?

18V anything... Nope.

12V, only if it's a Nicd or Nimh.
Lithium batteries have protection circuits that work in conjunction with the charger and the tool. Can't easily charge them, and overcharging individual cells can cause fires.



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Mule Meat

03-26-2020 06:36:51




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
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Won't work. He is waiting for his charge to be repaired.

=========

Short answer. Look at the battery. If it has 3 or more post (contacts) then no it cannot. The battery is charged in stages and uses each post to charge. And two + & - to power the tool.



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RM-MN

03-26-2020 04:48:51




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
Why don't you tell us what tool made by what company. The answer is maybe since we don't have enough information to make a real decision.



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Janicholson

03-25-2020 21:35:36




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
It might work, even then you are risking the battery from over voltage uncontrolled charging, or an internal controller that gives the charger "permission" to charge. Jim



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Russ from MN

03-25-2020 19:45:43




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
I use an inverter to change to 120 and then plug in the regular charger, doesn't take a very big inverter.



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Steve@Advance

03-25-2020 19:39:00




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
I wouldn't try wiring it direct.

They do make 12v chargers though.



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Geo-TH,In

03-25-2020 18:40:21




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 Re: Power tool battery in reply to john-mi, 03-25-2020 18:02:59  
Dewalt makes a charge to charge 18v from 12v cigarette lighter.



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