Flex Stacked Lithium Battery | More Power, Shorter Charge Times

Who owns Flex power tools? | Are Flex 24V Power Tools Any Good?

Flex Stacked Lithium Battery Levels Up Your Power Tool Game

The power tool world is learning about the benefits of lithium-ion pouch cell technology. The Flex Stacked Lithium battery takes advantage of that tech and sends it to a whole new level.


Flex Stacked Lithium Batteries Pouch Technology

Pouch cells open up the possibility for more than just a different form factor compared to round cells. Connection tabs open up far greater energy flow, resulting in higher power output and faster charging without producing dangerous levels of heat.

Flex Stacked Lithium Battery

How much of a difference does it make?

According to Flex’s data, it’s massive. Just look at this chart from the Flex Faceoff Round 2 video.

Flex Stacked Lithium Battery Power Chart

First of all, keep in mind Flex uses a 24V max system based on rows of 6 cells instead of 5, so there’s already an advantage built-in. Even so, two things stand out from this data. First, Flex’s compact 3.5Ah battery is producing the same power as DeWalt and Milwaukee’s 8.0Ah packs.

At the top of the chart, DeWalt and Milwaukee top out at 1800 watts—exactly the maximum power you get from a 15-amp, 120-volt circuit. Flex jumps all the way up to 2520 watts, giving the 10.0Ah pack potential beyond any 15-amp corded tool. In fact, it’s more than a 20-amp, 120-volt power source can provide.

Check out how Flex Stacked Lithium batteries compare to their standard ones in terms of power:

  • 2.5Ah: 480 watts
  • 5.0Ah: 960 watts
  • 8.0Ah: 1680 watts
  • 12.0Ah: 2520 watts
  • 3.5Ah Stacked Lithium: 1200 watts
  • 6.0Ah Stacked Lithium: 1920 watts
  • 10.0Ah Stacked Lithium: 2520 watts

Additionally, these packs can charge up to twice as fast and last up to three times longer than round cell packs, all while remaining 100% compatible with all Flex 24V tools.

With the 550-watt dual fan-cooled Flex Super Charger, here’s what you can expect for full charge times:

  • 2.5Ah: 27 minutes
  • 5.0Ah: 27 minutes
  • 8.0Ah: 27 minutes
  • 12.0Ah: 35 minutes
  • 3.5Ah Stacked Lithium: 15 minutes
  • 6.0Ah Stacked Lithium: 18 minutes
  • 10.0Ah Stacked Lithium: 30 minutes

Flex Stacked Lithium Batteries | Beyond the Pouch Cell

While the cell itself opens up significant doors, there’s more to the story. You can’t just slap some pouches in a battery housing, install it on the tool, and hope for the best.

Flex has impressive heat management from what they call ThermaTech Plus. It allows the cells to dissipate heat more effectively than other brands. The design also offers some cushioning that reduces the risk of failure if you drop the pack to the ground.

Add in electronic monitoring of each cell with advanced communication to the tool and you have a battery that’s safe to use in demanding applications with far greater productivity than standard round cell packs.


Flex Stacked Lithium Battery Price

Look for individual and multi-packs, starter kits, and combo kit packages with Stacked Lithium batteries to roll out over this year. Here’s what we expect the individual prices to run:

  • 2.5Ah: $99.99
  • 5.0Ah: $149.99
  • 8.0Ah: $199.99
  • 12.0Ah: $249.99
  • 3.5Ah Stacked Lithium: $179.99
  • 6.0Ah Stacked Lithium: $229.99
  • 10.0Ah Stacked Lithium: $329.99

The Bottom Line

The additional power potential coming from smaller batteries is really exciting. When you add in faster charging and a much longer service life, the transition to Flex Stacked Lithium batteries is one that makes a lot of sense and opens the door to all-new levels of power tool performance.

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Jesse Peden

In this new face off, they compared the new stacked lithium batteries to the OLD DeWalt battery platform, not the current DeWalt PowerStack platform. I want to know how they compare to current generation batteries, not a previous generation. Can you provide any comparison of your own?

elspodulate

waiting for makita to stick this type of cell in a 40v battery. can you immagine that ooomph off that. whips flex’s ass any day…….

Collin

This makes lots of sense and in terms of raw power available from the battery packs, these Flex Stacked Lithium packs kill anything Milwaukee has to offer. There’s a reason Milwaukee FINALLY started making M18x2 tools, such as their mower, or their new vacuum. A $999 “professional” grade mower isn’t going to cut the mustard with 18 volts currently. It’ll be limited to a maximum of 1800 watts, and that’s in ideal conditions. We all know that even current M18 tools can make the 12.0 overheat, much less a mower running outside in 100-degree heat. With M18x2, Milwaukee is no… Read more »

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