Air impact wrenches still have the advantage when it comes to brute strength. Depending on the type of work you do a cordless impact may not be able to replace your pneumatic wrench but can still be a great addition to your tool chest, with the ability to go any where with out the need of a air compressor or power cord.
There are quite a bit of battery powered impact hydraulic torque wrench on the market. Its important to make sure you choose one that’s going to meet your power needs and price range. They can range from 12 volt up to 24 volt batteries. Most of the time the higher battery voltage will be able to make more torque than a lower voltage tool.
Its always important to check the hydraulic torque wrench rating of the impact wrench your looking at and compare it to other models in the same price range. Another important feature is a torque setting on the wrench or a variable speed trigger. This will allow you to have more control over the amount of torque you are applying to the fastener. With out any kind of control over the amount of torque it can be very easy to snap the heads of the bolts your installing or damage the equipment your working on.
If the cordless impact has no torque setting there are other options such as torque sticks. These install between the hydraulic torque wrench and the socket and allow a certain amount of torque to be applied to the fastener. If space is a issue another great tool is a angle head impact wrench to get in those hard to reach areas. They will normally not have the power of the full size impacts.