I need polarity on B&D screwdriver 9072 type 3 charger input

Since you already have the universals, did you try reversing polarity? The center "tip" can be + or -

Either you can buy the original battery from Black and Decker or you can replace with the same mA rating with the regular types available in all stores any rechargebale variety with a good mA rating.
Couple in series and parallel to get the desired voltage and current rating.

The 3 RCA type connectors (red, white,black) are all pre-amp outputs, not inputs. (Cut the girl some slack) the black is for the subwoofer. The red and white are pre-amp outputs for either up converting from a 5.1 to a 7.1 system, or for running a X.2 (2 subwoofers L &R). If you are running 2 subs, be sure on one of them to reverse the polarity.

Stop!

There are no voltage and amperage "standards" for low voltage connectors found on devices made to run from an external "wall wart" or transformer type charger or adapter. Just because a connector "fits" does not mean the power is 1) the correct voltage 2) correct polarity 3) correct type (AC or DC) or 4) can supply the amount of power needed to operate the device.

You may have done irreversible damage to your device by literally "grabbing any old charger that fits" to power it. Obtain the correct charger - or if unable to find one; determine the characteristics needed by the device - those variables are listed in 1 through 4 above.

You may find adjustable power sources that allow 1) changing of tips to fit the device, 2) a selector to choose from a range of voltages, 3) a switch to select AC or DC output and 4) the ability to plug in the tip backwards so that the polarity reverses. The last thing needed, is to know how much current in amps or power in watts is needed by the device. The charger / adapter should be chosen on its ability to supply this power continuously - never choose a charger / adapter that provides less than any of the electrical requirements; otherwise damage to the charger or device may occur - and if left unattended, could overheat and cause a fire.

I hope this helps and good luck! Please rate my reply. Thank you.

there are several power cords on ebay for your camera as well as new batteries if you need one. Do an ebay search for MV 800 charger, here is an example of one I found. http://cgi.ebay.com/Desktop-Charger-Canon-MV800i-Camcorder-/380317041118?pt=Batteries_Chargers&hash=item588ca981de#ht_3278wt_1141

Hi Vic,

When looking to replace a battery charger for a device there are four things that need to be satisfied.

1. Minimum voltage (usually 10-15% higher than the battery)
   
2. Minimum Amps (usually marked on the device in milliamps (mA)
   
3. The plug has to fit
4. The plug needs the correct polarity (is the center positive or negative)
   

Of all of these, the most difficult can be finding a plug that fits. There are 'universal transformers' out there with interchangeable plugs, variable power settings and reversible polarity.

A Radio Shack type electronics store is a sure thing. Priced at $10-15.00.

But on your way, if you pass a GoodWill type second hand store, they usually have plenty of transformers of this type priced at about $2.00.

Best regards
Mike

You need a 4.0 - 4.5 DC 100 mA power source with center pin positive polarity.

I will assume that your light has rechargable NiCad batteries. Use the following advice ONLY if you are sure this is true. If the light is more than a couple of years old, this is probably true. Of the plug has to fit, but it must also have the correct Polarity, Voltage, and Amperage. The spotlight should be labeled where you plug the charger into it with these three critical parameters. They will also be indicated on the chargers. POLARITY --- If it takes a round plug, the polarity is indicated by a symbol that looks like a C, usually with a plus sign inside of it (this indicates that the center contact is positive). VOLTAGE --- this will be expressed as VDC input on the light, and VDC output on the charger. The voltages only need to match within about 10%. AMPERAGE ---- this will be expressed as mA (milliamps, which is thousandths of amps) or as A (which is Amps). 1000 mA = 1 A. This doesn't need to match precisely either. But if it's too low, the charge will take a while and you might burn up the charger (possibly literally burning it). If the amperage on the charger is high, that's OK, so long as the voltage is not high as well.
I hope this helps, Thanks for using FixYa. Al Kupchella

Here is your link to buy it.
http://www.centurytool.net/5140044_04_Charger_W_Small_Jack_p/5140044-04.htm

There are many many possible batteries you can use for this application, from lead acid to Lithium polymer. You will need to determine what type of power connector that will fit your unit's jack then make sure the polarity is correct. You can then wire connector
accordingly to battery you select. Make sure battery exceeds current requirements but voltage. If unit has internal charger, make sure the battery you choose is compatible or use dedicated charger