DeWalt 20V 5Ah Battery Comparison: XR vs Power Stack vs 3.5Ah Power Stack

Introduction

If you use DeWalt’s handheld 20V tools, the 20V 5Ah XR has long been the go-to battery: small enough to carry on an impact driver, yet with enough power and run time to swap onto a 6-1/2 or 7-1/4 inch circular saw to make cross cuts or rip plywood. The question is whether the newer, larger, and more expensive 5Ah Power Stack justifies the extra size and cash, and where the compact 3.5Ah Power Stack fits in. This comparison breaks down what each pack delivers in real cutting work.

Evaluation Criteria

The batteries were tested on a 20V vacuum and in board-cutting runs through dense 2 by Douglas fir, with each battery paired with its own blade and the saw left to let the blades do the work. These were single-run tests rather than scientific repetitions, but the results give a practical sense of power, run time, and heat behavior.

The 5Ah XR: The Everyday Workhorse

The current 5Ah XR is noticeably larger than older versions. A 2020 pack looks small next to the newest body, but cracking open a 2023 and a 2016 pack shows they use the exact same size 18650 cells. The main visible difference is that the plastic holder sticks out wider on the newer pack. In other words, the physical size has grown even though the cell format has not.

In cutting tests, both an older 2016 XR with at least 300 recharges and a 2020 XR performed well, cutting nice and easy along the fence with no problems. If you want a battery that balances size, run time, and price, this remains a sensible default.

The 5Ah Power Stack: More Power, More Recharges

The 5Ah Power Stack is a larger, more expensive pack with a nice rubber shoe on the bottom, similar in feel to Milwaukee’s packs. DeWalt claims it delivers twice the recharges and 50% more power than the equivalent 5Ah XR.

In the cutting test, the Power Stack genuinely seemed to have 50% more power, cutting about 20 to 25 feet more board than the 5Ah XR. It was the standout of the test: powerful, pleasant to hold, and impressive overall. The size is something you could probably get used to. The cost is harder to get used to.

Worth noting: in experience with the 5Ah Power Stacks, the 8Ah Power Packs, and the 9Ah FlexVolt batteries, all three are pretty close in power. Sometimes the 5Ah wins, most times the 9Ah wins, and they all run cooler than the 5Ah max batteries, with the 9Ah running the coolest.

The 3.5Ah Power Stack: Compact Power Over Run Time

DeWalt now offers three Power Stack sizes: the 1.7Ah, the 3.5Ah, and the 5Ah. The compact packs are now called XR Power Stacks, while the regular 5Ah XRs are just called max batteries. DeWalt claims the 3.5Ah, like the 5Ah Power Stack, has 50% more power than regular 5Ah max batteries.

Charged overnight and run with similar used blades, the max 5Ah cut 53 feet of lumber while the 3.5Ah Power Stack managed 45 feet. That works out to roughly 50% more power versus 43% more run time between the two. The Power Stack cruised noticeably faster without any extra pressure on the saw; it simply had more power.

Heat, Weight, and Cross-Brand Notes

Both batteries in the head-to-head maxed out at the same temperature before quitting. The max quit at 40 feet and had to rest before cutting another 15 feet, while the Power Stack cut 43 feet before quitting and, after resting, managed 2 more feet. The Power Stack clearly delivers more oomph per cut even at the cost of total run time.

One more observation for brand cross-shoppers: between Milwaukee, Makita, and DeWalt, Makita arguably has the nicest battery overall, but these are all pretty equal in testing. Milwaukee packs actually do a little better when run on DeWalt tools, because DeWalt lets batteries run free rather than throttling them down like some other platforms do.

Which One Should You Buy?

Stick with the 5Ah XR if you want the best balance of run time, size, and price for everyday tool swapping. Step up to the 5Ah Power Stack if you want more power per cut and the claimed double recharge life, and you don’t mind the extra size and cost. Choose the 3.5Ah Power Stack if compact size matters more than maximum run time, since it trades about 8 feet of total cutting distance for noticeably faster cuts.

Conclusion

The 5Ah XR remains a dependable all-rounder, the 5Ah Power Stack delivers real, noticeable extra power and durability claims, and the 3.5Ah Power Stack packs surprising punch into a small body. Matching the pack to how you actually work is what matters most.