Cordless Tool Basics
Is it better for batteries to be completely discharged before charging?
No. Just the opposite, you should stop using a battery as soon as you feel a substantial decrease in power from the tool. Completely running down a battery may damage the battery.
Why can’t I use a 9.6V battery in a 12V Drill?
The tools are designed to run at the specific voltage provided by the battery pack. Too much voltage, as well as too little voltage, can cause poor performance and life from the tool. The tool may run for short periods of time with the wrong battery pack, but it shortens the overall life of the product. This is the same reason corded products designed for 220V cannot be used in the U.S. where we have 120V outlets.
If I buy a cordless drill, what volt model should I buy?
A 12-volt model will handle the needs of most d-i-yers. For bigger projects, a 14-volt or higher model is a good choice. For lighter duty, a 9.6-volt model should be sufficient. For extended use, you should get two battery packs.
What type of drill do you recommend for do-it-yourself projects?
Most consumers use a 3/8-inch model that reverses, has variable speed and has a keyless chuck. You should get one that draws at least 3.5 amps.
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