So you’ve finally decided you need a cordless impact wrench. The right impact is a great addition to anyone’s toolbox, whilst the wrong one could make the purchase useless. A bad one could be either something which is way too overpowered for what you need it for (so long as you have variable torque this isn’t too bad, but at the very least it’ll likely be heavier and bulkier than necessary), or underpowered (this is much worse, as it nearly makes the tool useless). This article I’ll be covering what to consider in a battery. Just how much power you need, what to consider in a charger, and what type of battery you need.
The most important element of an impact wrench is power. The entire reason for a direct impact is to loosen those tough-to-get-off nuts and bolts, and if you don’t have enough power, you’re essentially left having an over-sized air ratchet. With cordless tools the ability comes from the battery, and the key spec the following is volts. Overall volts are definitely the electric measurement for power. But more volts isn’t always better… however it does mean bigger (if your comparing two of the same kinds of batteries), therefore if you’re worried about the dimensions of your cordless impact, you might want to choose a battery with less volts.
How often will you be making use of your impact? And for how long? Have you been the type that remembers to maintain the batteries charged? Having a charger that quickly charges your batteries can be quite important for a few people. Some more expensive cordless impacts have chargers that’ll perhaps you have up and running in 15 minutes, while older chargers will often occupy to 3 hours for any single battery. If you’re gonna be making use of your impacts for extended periods, or if you’re often on tight deadlines and can’t manage to watch for your batteries to charge, how fast toplistly will charge is a vital consideration.
Finally, what type of battery is the greatest? Nickel based batteries are definitely the older style, are less costly, but heavier and bulkier. NiMH specifically will lose its charge quickly in the cold. Lithium Ion batteries have a higher energy density than nickel based batteries, therefore you can have the same amount of power in a smaller package (or alternatively you can have more power within the same sized package). However Li-Ion batteries are the most costly. Odds are that if you pick an increased end cordless impact (which I urge one does to, the cheap ones just aren’t worth the cost), it’ll come with Li-Ion batteries, so this probably won’t affect which impact you purchase, but just in case you are considering older impacts, the difference in between the batteries is important to learn.
If you’re investing in a new cordless impact wrench, remember how much power it’s got (and how many volts battery is), what to consider in a charger, and just what the difference is involving the different types of batteries.
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