Flex Power Tool Kit Deals: Three Battery Bundles With a Free Tool

Introduction

Flex is running a promotion that makes its cordless platforms unusually attractive: buy a battery kit, add it to your cart, and the store automatically loads a set of promotional bare tools you can pick one from for free. There are three tiers to this deal, so whether you have a larger budget or a smaller one, there is a bundle that fits. Here is how the three kits break down, from the biggest spend to the smallest.

Top Tier: Flex Stacked 6.0 280 Watt Stack Lithium Battery Kit

This is the flagship bundle of the promotion. The Stacked 6.0 uses stacked lithium pouch cells, similar in concept to the battery arrays found in smartphones, and the kit includes a rapid charger. Once the kit is added to the cart, the promotion automatically loads a selection of free bare tools to choose from, including a 1/2 inch high-torque impact wrench, a 3/4 inch high-torque impact wrench, a rotary hammer, the Side Winder, a rear-handle saw, a die grinder, and a two-speed mud mixer. You pick exactly one.

The rear-handle saw in particular is described as an absolute monster, which makes it a compelling pick if you need serious cutting capacity. If your budget allows the top tier, the combination of the largest stacked lithium pack, a rapid charger, and a free high-value bare tool makes this the strongest overall package of the three.

Mid Tier: Flex 3.5 Stack Lithium Starter Kit

The midsize option is the 3.5 Stack Lithium starter kit, which includes the 3.5 amp hour stacked lithium battery and a rapid fast charger. As of 2024, Flex still backs these tools with a lifetime warranty, provided you register them after purchase, which is a notable long-term value argument for starting on this platform.

Like the top tier, adding this kit to your cart unlocks a free bare tool, with a different lineup suited to general contracting and remodeling work. The choices include a hammer drill described as an absolute monster, a quick-eject chuck model where you push a button and the chuck opens for fast bit changes, a compact mid-torque impact wrench, a drywall screwgun, a brushless barrel-grip tool, a jigsaw, a one-handed reciprocating saw, a grinder, a sander, and a router. The sander and the router both get strong praise, so either is a safe free-tool pick.

Budget Tier: Flex 2.5Ah 24V Kit with 1/6 Fast Charger

At $129, this is the entry point of the promotion, and it is still a genuinely good deal. You get the 2.5 amp hour battery, which uses smaller cylindrical cells rather than stacked lithium pouches, along with the fast charger, and one free bare tool of your choice.

The free tool selection here is lighter-duty but still useful: a cutout tool, the Flex inspection light, the Flex 24V light, a radio, a blower, or a fan. The blower and the fan in particular come highly recommended. For $129, getting a battery, a fast charger, and a bonus tool is an easy way to step onto the Flex 24V platform without a big commitment.

Which Flex Kit Should You Buy?

Choose the Stacked 6.0 280 watt kit if you want maximum battery capacity and are tempted by the heavy-hitting free tool options like the rear-handle saw or the high-torque impact wrenches. Choose the 3.5 Stack Lithium starter kit if you are building out a core drill-and-driver collection, especially given the lifetime warranty on registered tools. Choose the $129 2.5Ah kit if you simply want an affordable entry into the platform with a handy accessory tool thrown in.

All three bundles share the same core mechanic: the free tool loads automatically into your cart once the kit is added, so make sure you complete the checkout flow through the promotion rather than buying the components separately.

Conclusion

Flex’s current promotion covers three clear budget tiers, and each one includes a rapid or fast charger plus a free bare tool of your choice. The Stacked 6.0 kit is the pick for heavy-duty users, the 3.5 starter kit is the best all-around entry with a lifetime warranty, and the $129 2.5Ah kit is the budget-friendly way in. Whichever tier you choose, picking your free tool during checkout is where the real value of this deal sits.