You can also draw fewer amps and run longer. Jon Bucklew did an outstanding demonstration of this with the Makita 18V LXT Brushless Angle Grinder. You can draw a higher amperage from a battery and get less run time. Unlike voltage, this is not a fixed figure. A 5.0 amp hour battery will give you 5 amps for an hour. All other factors ignored (like temperature and vibration), a 3.0 amp hour battery will give you 3 amps of current for an hour. Amp Hours: Wiring to Increase Amp HoursĪ simple definition of amp hours would be the amount of amperage that the battery pack can deliver for one hour. Fortunately, the tool industry has settled into 12V, 18V/20V, and 36V platforms for tools while other combinations are out there for outdoor power equipment. In theory, you could do a 12V, 16V, 20V, 24V and so on. You’ll increase by roughly 4V for each new one you add. If you want more power, simply add another cell in series to the battery. For now, let’s focus on the voltage as power. I’ll explain those anomalies in a later article. Even with that, the math doesn’t work out perfectly. That 3.6V cell actually produces a little more than 4V at a full charge state. They can produce a higher voltage at a full charge state than low. The voltage varies slightly within the cells based on the amount of charge that they hold. If you’re doing the math along with me, you already know that there’s an issue. Need a 12V battery? String 3 of them together in a series. Each battery is capable of delivering a specific amount of voltage, typically 3.6 volts in the 18650 lithium-ion cells that are used. If you were to take apart your battery (please don’t do that!) you would find the individual battery cells that store and deliver power to the tool. Voltage vs Amp Hours: Wiring to Increase Voltage Basically, the larger the fuel tank (watt-hours), the higher the energy potential you have – it’s just a matter of how you use it. If you look on the label for most batteries, it will tell you the total watt-hours of its capacity. These two measurements are born of the actual battery capacity-a term known as watt-hours. Most people boil cordless tool numbers down to the idea that voltage is equivalent to power and amp hours are equivalent to run time. This is great when there’s a virtually infinite power supply. With corded tools, we often describe the amount of power based on the number of amps that it draws. amp hours is one of the most basic questions asked of cordless tools.
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