Five years ago, our test of the first generation of lithium-ion (Li) powered reciprocating saws determined that for getting the job done quickly, 36-volt tools were the ones to buy—most 18-volt models weren't up to jobsite challenges. But I'm happy to report that advancements in motor and battery technology make some of the newer 18-volt models capable of serious work. They're worth considering to add cordless convenience to your demolition and other recip-saw jobs.
I tested the tools in kit form with a battery, charger, and carrying case (where available). Keep in mind that these saws are also sold without batteries or chargers (referred to as bare tools) for users who already have batteries and chargers from the same manufacturer.
If that's your situation, you might decide not to buy the tool that we thought was the best. Instead, you might just need to know whether your brand is good enough to get the job done. I included performance details and provided complete information on each saw we tested.
USING THE SAWS
During my time with these tools, I evaluated and tested each one. I used 6-inch-long, 6 TPI Lenox blades (B656R) to cut through blade-wrecking test planks similar to the ones I used for my reciprocating-saw-blade test in the Winter 2012 issue of TOOLS OF THE TRADE.
The planks are made from a piece of OSB sandwiched between 2x6s and capped with a layer of 5/8-inch drywall and more OSB. The central piece of OSB is flanked by 12 rows of nails glued rigidly into grooves—10 rows of 16d commons, one of 16d sinkers, and one of 8d sinkers. The result is that each pass of a saw blade though these planks cuts 12 nails.
I clamped the planks into a waist-height vise so I could really lean into the cuts. All the tools could cut through these test planks, but while some sprinted, others made it only at a crawl. When I really pushed the tools, the important performance differences became evident.
My tests enabled me to classify the saws as light-, medium-, or heavy-duty tools. I also categorized them by how much they vibrate in use: low, medium, medium high, or high.
And after making hundreds of cuts with these saws, I made comments about all of them, some that you can read below. You can also see the saws' complete specifications and comments on them.
When testing the saws, I rated their performance in two ways (see charts at right). To rate power, I timed how long it took each saw to cut through a doubled 2x6. And to rate runtime, I counted the number of times each saw cut through a doubled 2x6 on a single battery charge. (Before every test, I put a new blade in each saw.)
While using the saws, I discovered a few basic tendencies they displayed while under load. Power is the main takeaway here, but a reciprocating saw needs more than just that to excel. The saws' ability to cut aggressively and for long periods of time relies on several factors: keeping the battery from overheating, longer stroke lengths that clear sawdust faster, and vibration control that keeps the blade firmly in the bottom of the kerf.
I pushed the tools hard because that's the way they are used in the field. No one babies a reciprocating saw. Plus real-world use allowed me to separate them into three performance categories:
1. Heavy-duty saws could take as much force as I could apply, without stalling or bogging down dramatically, so pushing harder generally resulted in faster cutting. These tools cut the quickest and were the least temperamental and therefore shaped the category I preferred overall. The dogged performance of the four Milwaukee and DeWalt tools earned them each a place in this category.
2. Medium-duty saws had a limiting pace that they couldn't be coaxed out of, but at least they acted predictably. Pushing harder didn't make them cut faster, but it didn't slow them down much, either. Though they make you wait longer for the results, they get the job done, so one of these saws may be all that's needed for average tasks. Saws by Bosch, Hitachi, and Panasonic made the cut for this category.
3. Light-duty saws are more trying to use because when you push harder, motor speeds (and already conservative cutting speed) drop dramatically, and they stall frequently. These tools actually perform better if you let up on the pressure, but I find it difficult to use a saw that I have to baby while trying get the job done. The Makita, Metabo, and Ridgid saws fell into this category.
It's not surprising that a battery with higher amp-hour ratings will run a saw for a longer stretch of time than one with a lower rating. As such, runtime tests are often a test of a battery, not of the saw.
So, instead of measuring the time a tool ran on a battery charge, I measured how much work each tool could do on a charge. Consequently, if a tool is a slow performer, it may actually run longer than a fast-cutting tool, but what's important is the work that results from the operating time. When fully loaded in 3-inch-thick cuts, even the best saws may only cut for five minutes before needing to be recharged.
The trade-off between a powerful and a gentle tool is usually how fast it cuts. For the sake of my carpal tunnel syndrome and bouts of tendonitis, I wish there were a fast-cutting tool that didn't vibrate a lot, but the fastest-cutting tools are all a bit on the brutal side.
That being said, because the most comfortable tools are on the slow side, I'd rather endure a reasonable amount of vibration to get the job done faster instead of losing time waiting on a gentle tool to make the cut. Here's how the tested tools "shook out" in terms of overall felt vibration during many types of cuts:
Low: Hitachi, Metabo, and Ridgid
Medium: Makita, Milwaukee Fuel
Medium-high: Bosch, Milwaukee