![]() If it’s important for your drill to last longer on a charge, you’ll want to choose a lower voltage and a higher Amp Hour rating. It may help you figure out what type of battery to buy or even whether you want an 18v cordless drill or a 20v drill. So, now that you know how to figure out how many amps your cordless drill uses, you can find this information for virtually any drill. See the table below to check how the current draw affects run time. So, if you’re running 6 amps, you can expect to have to recharge after about 30 minutes. Remember that a 3Ah battery will draw1 amp for 3 hours. Now, let’s say your battery is rated 3Ah. This will give you the amperage draw of the drill.įor example, an 18v cordless drill with a 250-watt motor will draw about 14 amps. How to Calculate Amperage DrawĬheck to see the wattage that the drill’s motor is rated for.ĭivide the watts of your cordless drill’s motor by the total number of volts on the battery. You’ll also need a battery that’s rated for the voltage of your drill.Īnd since the amperage will vary based on the wattage of the drill’s motor and the voltage of the drill’s battery, you’ll need to perform a simple calculation to determine the amperage draw for your drill. So, a 20v cordless drill will always draw more amps than an 18v cordless drill. The more pressure (volts) the water is under, the faster it will go (amps). Now, to figure out how many amps your cordless drill uses, let’s go back to the pipe analogy. How Many Amps Does A Cordless Drill Draw? And if you’re shopping for new drills, it should be listed in the product description or on the box. You should find the Ah rating on the battery itself. If your cordless drill runs two amps, that same battery will last half as long on a charge. A fully-charged battery will usually run for as long as the ampere-hour rating of the battery.įor example, a 3Ah battery will run 3 amps for one hour. What Are Ampere Hours?Īmpere hours (Ah) are a measure of the battery’s energy storage. Now, for that weird measurement on your drill’s battery. Watts is simply a measure of electrical power. Voltage would be similar to measuring the water pressure while amperage is more like measuring the flow rate of the water (the speed in which it’s flowing).Īnd now for the last measurement, you’ll need to know in order to figure out your drill’s amperage draw: Watts. Here’s the simple answer: Although both measure electrical current, amperes measure the speed of the current while volts measure the force. So, what’s the difference between amperes and volts? You’re probably looking to buy either an 18v or 20v cordless drill, so which is better? “Okay, so then what are volts?”Īnd this is a natural next question because the voltage is clearly an important measurement used in cordless drills. There are a few terms that might be confusing when you’re trying to figure out which cordless drill to buy or how long your drill will last on a charge.Īmperes (or amps) are a unit of measure, and they measure electrical current. Here’s a hint: It all has to do with the Amp Hour rating of your battery, and that means nothing unless you know the drill’s amperage draw. The simple calculation for how many amps a cordless drill uses is Watts divided by Volts.īut in this post, I’m going to break down what each of these measurements means (in simple terms) and how to figure out how many amps your drill uses.īy the time you’re done reading this post, you’ll know exactly how long your drill will last on a charge. Because if I could figure out how many amps my drill uses, I could figure out how long it’ll last on a charge. This left me wondering about how many amps a cordless drill uses. Needless to say, it was time to finally complete that home improvement project - only, the drill’s battery didn’t last long enough on a single charge. ![]() I recently brought home a shiny new 20v Dewalt drill and I couldn’t have been more excited to test it out.
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