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What You Need To Know About Battery-Powered Cordless Tools
Lithium-Ion Dewalt DC9091 Power Tool Battery
You’ve probably heard the term “lithium-ion” battery before. You might even be using one right now. It’s a popular type of battery commonly used in home electronics and cell phones that delivers a constant stream of energy. Lithium-ion batteries have two main benefits – they charge quickly and they discharge at an even rate, regardless if they are 100% or 5% full. Tools batteries that don’t use lithium start strong, but power fades gradually.
Battery Voltage
Voltage is a measure of how many individual battery cells are in a particular Makita 1220 battery pack and how those cells are configured (or wired) together. The higher the voltage, typically, the more cells that are in the battery pack. So when comparing a 40V pack to a 20V pack, in most cases the 40V battery pack will have more cells which means more power capacity available.
Battery Ah
The Ah, or ‘Amp hours’ rating of the battery, indicates the amount of charge that is stored in the battery. Basically, the higher the number, the more energy that is stored. Ah ratings affect the run time and performance of the tool. Simply put – more watt hours = more “fuel” and longer run times.