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Kinh Nghiệm về DeWalt product reviewer 2022
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Much of the benefit of battery-powered tools comes down to how much more portable and nimble they are than their corded brethren. But that can often come at the cost of power, so the power-to-weight (PTW) ratio is a handy gauge of how much oomph they pack into their smaller frames. Tools with a higher PTW are more productive, andin the construction tradesthat can translate to more income because you may get more done in a days work. A favorable PTW ratio is also a limb-saver if youre holding a power tool over your head or working with it at the end of a fully extended arm for any period of time. A tool thats less tiring to use is one thats safer. But its also a big giảm giá if youre just a homeowner working on your own place. It can help you achieve more satisfaction from the job and stay safer, and it may even improve your workmanship.
But PTW will suffer if a cordless tool, and its battery, is made too big in an effort to compete with the power of a similar corded model. In so doing, brands can rob their tool of the nimble quality that was supposed to come without a cord attached to a 120-volt outlet. DeWalt has seemingly solved this with the introduction of its Powerstack battery system (which goes on sale next month). And after our testing, we can vouch for the platform. Its expensive when compared to the companys existing lithiom-ion batteries, but DeWalt managed to make it smaller and lighter while churning out power comparable to that of a corded tool.
20-Volt Max Powerstack Battery
The Powerstack uses a form of lithium ion battery with cells shaped like flat pouches, rather than cylinders. To visualize this, picture unwrapping the layers of a cylindrical lithium ion battery and pressing them flat. You can take that flattened battery and fold it into a pillow-shaped pouch (or other shape) if you wanted. There are several advantages to this. First, there’s less wasted space between cells, so you can pack more power-producing battery into a given unit of space. Second, the cells are simpler and require fewer soldered connections. Fewer soldered connections increase reliability since there are fewer connections to fail. You can also solder these cells together in a manner where if once cell fails, the battery continues to operate. According to DeWalt, the sum of these features make pouch cells run cooler and produce less waste heat per unit of electrical output and in doing so this makes them more efficient at converting electrochemical energy into electrical energy than batteries with cylindrical cells.
The slimmest Powerstack is 15 percent lighter than DeWalts most comparable two-amp hour lithium battery while being 50 percent more powerful, per the companys claim. Its also important to note that the batteries can power any of the companys existing 20-volt power tools and recharge via any of the companys 20-volt chargers.
DeWalts illustration of Powerstack next to its existing lithium-ion DCB203 battery.
We were impressed when we used the battery in DeWalts new ultra-compact DCF850 impact driver. With the battery, the tool weighs only 2.6 pounds, but it drove No. 10 x three-inch structural screws with a vengeance.
However, impact drivers are short-burst power tools. We know from having conducted hundreds of hours of power-tool testing that if you want to really drain a battery then you need to do some work with steady friction. This can be repeatedly drilling holes through construction lumber with a spade bit or sawing with the blade completely submerged in lumber.
So thats what we did. After running some test laps using the impact driver, we slid the Powerstack battery into the 6.5-inch cordless circular saw DCS565 (seven pounds with the battery). We lowered the blade to its maximum cutting depth of 2 38 inches, mounted a Douglas fir 2 x 12 on edge, and plowed straight down the edge of the board. You can make two cuts that way, slightly offsetting them, then flip the board edge for edge and perform it again.
We were amazed at how easily the saw, and therefore the Powerstack battery, handled this work. There was no tripping from thermal overload; we simply ran repeat test cuts until the batterys full charge was spent. That last point is an important one. A battery that runs cooler is one that will last longer. DeWalt estimates that its Powerstacks will have twice the lifetime of its current batteries. While thats good news to anybody who uses power tools, its particularly welcome to professionals who will likely put more wear and tear on the tool and battery in a week than a homeowner may in a year.
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