Question about Mx Black Max 24v Cordless 1/2 Inch Drill / Driver

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My new Blackmax drill battery charger does not put out enough voltage to charge the 24 volt battery. I have only used the drill one time and have lost the purchase receipt. Where can I get the charger repaired.

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You can find a repair center on the link below. You just need to put your zip code in to find the nearest one to you.

http://www.blackmaxtools.com/customer_service/service_center_locator

Good Luck

Posted on Jun 13, 2010

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Posted on Jan 02, 2017

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Can I use regular charger on 18 volt batt


* Like a 12VDC auto (car battery) charger? No. It does not have enough voltage to overcome the initial surge (about 20-22 volts)
* If this is a Lithium Ion pack the it should be putting out a minimum of 16 Volts DC to a maximum of 21 Volt DC.
* The battery (or charger) also needs to monitor the temperature of the batteries, Charge voltage, and Charge rate. This is to prevent over charging and over heating.
* Just slapping a charger on any multiple cell battery pack will destroy it if it's overcharged (over heated).
* If you do have a charger but the charger won't recognize the battery then it may be possible to give it a "boost" with another full charged battery (has to be the same type). This is where you connect the batteries in parallel (Positive to positive, negative to negative.) Let it charge for a short time 15-20 seconds should do it. Try the charger again.
* 18V Battery restoral (with variable power supply); https://www.youtube.com/watch?v=4Gj4yFX58UU
* Using existing charger to fix battery (does not always work); https://www.youtube.com/watch?v=6GfPKg05ZIU
* If your using NiCad batteries then you will have to "Zap" the battery (This is a bit hazardous); https://www.youtube.com/watch?v=5B9rx7hoizk
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1 Answer

I have a fully charged 24 volt Firestorm battery, that when connected to my drill barely turns it? What is wrong?


Do you also have a good battery that runs the drill well to proof the drill is good, and a volt meter (multi meter)?
I have several cordless tool batteries that show the rated voltage on a meter, and register as fully charged when on the charger, that no longer have any current capacity. They will barely turn the drill and die in seconds. This is a different problem than when freshly charged run fine but lose their charge in a few days or so. That is caused by internal short circuits in some or all the cells from "dendrites", a build-up of small amounts of the cell plates as little branches growing on the plates until they reach the other plate, causing a tiny short circuit. Dendrites can sometimes can be burned off, the way I do it can be extremely dangerous and I do not recommend it. I do it by putting 4 battery chargers in series, giving me an open circuit voltage of 59 volts. I for a no more than 4 seconds connect them to the battery - to - and + to +, with a current in excess of 50 amps. The battery gets hot and could explode, so I do it by reaching around a 1/2" thick poly-carbonate shield. Lacking a shield, i use a power strip to plug the chargers in Have the power strip unplugged from the outlet or extension cord, connect the charger clips to the battery, and from a distance, plug in the power strip just for 2-3 seconds. The battery may be quite hot. I then check the battery voltage, it is usually a bit higher than the voltage rating. I put the battery in the drill and if it makes a few turns, i run it till the drill stops, then charge the battery normally. I use 2 small 12 v chargers that have a 50 amp jump-start setting and two that have a 10 amp rating.
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1 Answer

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Could be the charger, or the batteries are defect. Sometimes just the contacts are dirty or oxidised. Make sure they are clean.
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1 Answer

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No. It will not charge
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It sounds like your charger is faulty. Try to measure the voltage of the batteries. If the nominal (workingh voltage of the batteries are 19,2 volt, then they should invrease to about 22 volt while in the charger. If the voltage does shoot up when the charger is on, maybe even to 25 volts, (which should turn the green light on) the new battries are dead!
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