Question about Dewalt 12V XRP Battery Pack

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Holding battery charge on 12v DeWalt batteries

I have both 12v and 18v Dewalt drills. The 18V is outstanding, but the 12V will not hold a charge on either battery. I can charge it up and it works fine for a while, but even on a full charge, the next morning it is down...both batteries act the same....the 18v drill holds the charge just fine.

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Are batteries for the dewalt cordless drill interchangeable? Will an 18 volt battery fit in a 12 volt drill?

Posted on Feb 24, 2010

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Time to replace the batteries. Some batteries will not last very long. My original ni-cads on a Ryobi lasted only 1yr, and the replacement ones are 2yrs old and are still OK. You might be able to check the manufacturing date on your original batteries and that will give you an idea of how long they sat on the shelf before you started using them. Rechargable batteries have limited shelf life.

Posted on Aug 27, 2008

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That is because of the battery type.  The batteries are nicd Nickel Cadmium and after 24 hours lose a good percentage of their charge.  The Dewalt batteries should be left on the charger, if you read the manual you will discover this is what Dewalt recommends.  It not only does not hurt the batteries it allows the charger to put the batteries through maintenance cycles.

Posted on Dec 30, 2008

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I have read somewhere that running the battery down, and then shorting the battery, putting a wire acrooss +/- termanals. This interrups the recharge memory within the battery.

If this does not work the a cell my be gone and you can get these repaired

Posted on May 19, 2009

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Hello friend,
These sort of batteries need to be charged discharged quite often. ALWAYS read the manufacturers advice when you get a new one. If you dont charge it properly first time then it will NEVER work at full capacity.and will not last a long time
It appears your battery is now finished and will not hold its charge for long. All you can do is replace it ...sorry.

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I have one of these. 2c7c66c8-687d-4eff-b1b9-7685d2c6ebab.gif
Here you will see how the drill is mounted in the device. Position (b) around the handle and tighten it up untill drill seats firmly in place. Take a speed square, or normal square and eyeball or measure the drill to see if its straight. Use the alignment adjustment (A) to fine tune the drill to get the drill bit straight and square. Tighten up all the nuts holding drill in device and recheck the drill bit for straightness.. Put your work under the drill, press the trigger and lock into place to get the drill to constantly run without finger on trigger, pull down the press lever to drill your hole... Hope this helps!

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