Battery Size
For cordless tools, power is determined by battery voltage: the higher the voltage, the more power and torque the tool has available. While more power and torque may seem like like something you want, there are trade-offs to be made. With high voltage cordless tools, along with the additional power, comes additional cost and additional tool weight.
Here is a typical comparison to illustrate the point. A typical 9.6 Volt cordless drill will typically weigh in the neighborhood of 3-1/2 pounds and cost anywhere from $35 – $150. As a comparison, a 19.2 Volt cordless drill can weigh up to 10 pounds and cost in the range of $125 – $300. If the increased torque and power of a 19.2 Volt cordless drill is really needed, the added cost may be worth it. But if you are using your cordless drill to occasionally drive screws in your home, a 19.2 Volt cordless drill is probably not worth it since it is harder to use (since it is heavy) and money not well spent. If you really do not need the additional power, a cheaper, light-weight cordless drill will probably suit your needs much better.
Number of Batteries
Another point to consider when...
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