Cordless Tool Battery Test Yields Surprising Results

milwaukee redlithium battery testCordless power tools succeed or fail on their batteries, and Milwaukee is a power tool manufacturer that claims to have developed proprietary battery technology that beats everything else on the market in a big way. Figures like 40% longer run time between charges and 20% more power than the best competing batteries are being quoted, and this sounds like typical advertising hype to me because those gains are so huge. That’s why I put these numbers to a very rigorous, real-world test.

I used an 18-volt impact wrench to drive 1/2-inch diameter by 6-inch long lag bolts into and out of predrilled holes in the side of a red oak test log as many times as possible on a full charge. I used the identical tool to test two batteries – one was Milwaukee’s regular 18-volt and the other a RedLithium 18-volt. To make the test most accurate, I ran each lag bolt in and out of a 3/8-inch diameter pilot hole 10 times, before moving onto a new hole. More drives than this and the holes got too large to maintain consistent friction. Fresh holes mean tough driving, and that’s what I wanted. To measure claims for increased power, I also timed how long it took to drive each batch of test bolts from start to dead battery.

To ensure consistency, I ran the test for each battery twice, after a full charge and recharge, and after the impact wrench itself cooled down. In the end I discovered that not all commercial claims gild the lily. In fact, Milwaukee has understated RedLithium performance based on my lag bolt test results. Work completed on one charge was a whopping 73% greater for RedLithium, while driving each screw an average of 18% faster. Be sure to see a video of my test in action.

 

Learn More Every Saturday!

FREE weekly tips and advice to make your home work better, whether it’s a rural homestead or a place in the city.

Your subscription could not be saved. Please try again.
Your subscription has been successful.

Just want to say how much I enjoy your Saturday morning newsletters and website. The content is always excellent... - FL

Thanks so much for the terrific work you do, and the outstanding resource you provide. - KS

Your videos are outstanding! Very instructive, and animations and your speech really helps to get the messages! - DB

Baileylineroad is supported in part by advertising. If you can't see the ads below, please consider turning off your ad blocker when visiting our site, or subscribing to our newsletter. Thanks for visiting!
0 Shares
Tweet
Share
Share
Pin