Cordless tool battery tester

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The cells are the same 3. Each pack of 5 is connected in series and then the two packs are connected to each other in parallel. When connecting cells in parallel the amp hour rating is combined, but not their voltage — the opposite of connecting in series.

The battery has two 18V, 2. While the amp hour rating does not equal power, you will generally get a little more power from the larger battery. The results are pretty interesting. To Create Hundreds of Woodworking Projects.

Download my Free Guide to learn what they are, why you need them, and how they fit in almost any small space. 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 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. 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.