Question about Dewalt DC727KA 3/8" 12v Cordless Drill/Driver Kit

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It doesn't run even with a charged battery pack.

While using my cordless to drive in fasteners on my deck, the power began to wane slightly and the bit broke inside the head of the fastener. The bit is a 2+ and is 3.5 inches long. I found another bit that was shorter, but the power wasn't as strong and the bit kept coming out of the fastener. So I charged the battery pack for an hour, removed it and charged the spare pack. I removed that before going to bed. In the meantime, I bought two extra bits that were identical to the one that broke. In the morning, I put on a pack and got zero power. I checked the trigger and it was set in the forward position. I don't know what torque to use, but that shouldn't matter, should it? Neither battery packs produce any results. I charged one for several hours but I still get zero power.

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Dear T,     The problem here is not your driver, but what you are asking it to do.  A good rule of thumb for carpentry jobs is "Always use the right tool for the job!" I work in the carpentry shop at the metropolitan opera in New York.  We use 14.4v and 18v cordless driver drills only.  However, you should know that cordless tools are to be used for small, short jobs.  Once you subject a cordless tool to constant, repetitive tasks that require lots of power, the tool will suffer performance problems and may fail.  Your broken bit indicates that you are expecting this tool to do more work than it can handle.    When driving long (2-1/2" or longer) screws into very hard (most decks are made of pressure treated lumber at least 1" thick) material, the proper tool is a corded drill.  This tool is made to deliver constant force for long service cycles.   When driving screws over 2" into hard woods or other dense material, any cordless drill is only good for less than 6 cycles of use.  A 12 volt battery will give out after several drive cycles under this type of demand.    Unfortunately I think you have depleted your batteries life expectancy.  Most Ni-Cd batteries will only last 1 to 2 years under normal wear.  I think your batteries will need replacement or repair.  Good Ni-Cd repair centers are hard to find, but with determination and persistence, you may find a battery recycler who will replace the cells in your batteries for a fee of about 1/2 the cost of new batteries.  DeWalt batteries are not cheap, so you will have to determine your best choice.  To drive several screws into your deck, I would recommend a corded drill.  It will stand up better under the demand.      As for broken bits, heavy use will always take a toll on your bits.  They will break less if they fit the fastener perfectly.   Also care must be taken to drive the fasteners in perfectly straight, perpendicular to the work surface.    Remember the adage, "Always use the right tool for the job!".  Take one of the fasteners with you when you but new driver bits.  Check for the best fit to the fastener you want to use.   For decades the standard drive bit has been the "phillips" bit.  At the Met we only use "Robertson" drive or square tip wood screws.  They cost more but slip less, and the bits rarely break. Always select a bit that best fits your fastener.    I hope this solution brings you success in your projects.  Best Regards,  Michael Mittelsdorf

Posted on Jan 11, 2009

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