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How do you determine the positive and negative terminals on a Dewalt 18 VDC battery. There are no markings. The baterry is an XRP. Thanks. Ismael Nazario

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Positive always red nagative always blak

Posted on Aug 23, 2010


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How to determine positive & negative terminals to jump-start batteries/charger for Milwaukee 18 volt batteries and power-plus 9.6-18volt universal charger

Put a meter across the terminals the red is positive the black neutral if you get a positive voltage you have them the right way round if not you'll get a negative voltage.

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How do i identify the negitive and positive terminals on my 18 volt batteries.

About the only way to do that is with a multimeter, preferably digital. Touch the probes onto the contacts and if the red probe is on the positive terminal, the reading will be a straight reading, eg. 18.6v. If the black probe is on the positive your reading will be a minus (negative) reading. eg, -18.6v. If you are using an analogue meter, you have to be quick or you will damage the instrument. If the red probe is on the positive terminal you will get a reading. If the black probe is on the positive reading the needle will go of scale below the zero point. Use a high voltage setting to minimise the input to the meter.

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Can I use a dewalt 18 volt dc9098 battery on the dc385 Saw?

If you have the handle disigned for the lithium battery becareful using the 9096 battery as it moves in the handle a lot and can hit the terminal on the switch wrong and bend it or break it. Also it will get a lot of vibration when running and because it doen't have the support that it needs for a 9096 it wiill likely brak a contact on the switch eventually. the factory does say they work in any tool however.

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Can I use a 18 volt XRP battery in the DeWalt DW938 Reciprocating saw?

Yes. Dewalt says the 18volt XRP battery is compatible with all Dewalt 18volt tools

Have a great day.

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Xrp 18v dewalt drill worked fine with plenty of juice in battery and suddenly stopped working. What could be wrong with it?

if your batts are ok and the batt connection terminals look ok you may have either faulty switch burnt off wire at brushholder or reqire new brushes

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Hi guys I was wondering on the dewalt battery wich side is positiv e which side is negative thanks james

is your battery is new and you want to install?if that so,you can distinguish between positive & negative by means of:
1. get rid to the color of wire or marker.The
standard color of positive is red.
2. If no color,positive have a cross(+) mark & negative
is minus (-).
3. If you have a multi-tester,adjust the control to 50v on the "DC" section of the tester and connect the tester's rod to the batery terminal.The rod color red & black whics means positive & negative..if for instance you connect the red rod to the batery terminal 1,and the black rod to the batery terminal 2,and the neddle or indicator of the multi tester moves through clockwise direction:
it means that the batery terminal where you CONNECTED THE RED ROD IS THE POSITIVE...but when you do the same process or same way to test but the needle of the tester goes into counter clockwise direction" it means that the batery terminal where you connected the red rod is the NEGATIVE.

But how about if you dont have a multi-tester?You can do this way..:
get an electrical motor of a turn table or a blower of a computer.the terminal of the said motors are red & black.Now,you conect fix the red terminal of the motor to the one terminal of batery and you conect the black terminal of the motor to the other terminal of batery( BUT CONNECT IT IN JUST ONE (1) SECOND AND NOT TOO LONG BECOZ YOUR MOTOR WILL BE BURNED DUE TO OVER VOLTAGE). Now,if you do this test and you noticed that THE TURN OF THR MOTOR IS IN CLOCKWISE DIRECTION" it means that you had connected the right terminals,.so gid rid to the colors becoz the batery trminal where you connected the red terminal of the motor is the POSITIVE.

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The brushes might need to be replaced. You can find them on Ebay and are easily to replace.

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Go to and in the middle of the page towards the bottom type in your model number and it will take you to a page where the schematics are.

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