The DeWalt Flexvolt battery is special. It changes voltage automatically. It works with different DeWalt tools, including 60V and 120V tools. It also works with 20V tools and chargers.

You can get a free battery with these tools:

DeWalt Flexvolt 60V MAX Brushless Concrete Mud Mixer/Drill with E-Clutch costs $299.

DeWalt Flexvolt 60V MAX Brushless 7-1/4 in. Circular Saw with Brake costs $299.

DeWalt Flexvolt 60V MAX Brushless Reciprocating Saw costs $299.

DeWalt Flexvolt 60V MAX Brushless Small Angle Grinder with Kickback Brake costs $299.

DeWalt Flexvolt 60V Angle Grinder costs $299.

DeWalt Flexvolt 60V MAX Brushless 7-1/4 in. Wormdrive Circular Saw costs $329.

DeWalt Flexvolt 60V MAX SDS Plus Rotary Hammer costs $499, which is $50 off.

The Milwaukee M18 5.0 Ah XC Battery is a good choice. It works with all M18 cordless power tools. It lasts twice as long as a standard battery. It also recharges quickly, in 90 minutes or less.

Some M18 tools that qualify for the deal are:

Milwaukee M18 Fuel Hackzall Reciprocating Saw costs $199.

Milwaukee M18 Fuel Compact Router costs $229.

Milwaukee M18 Redlithium Forge Starter Kit with 8.0Ah Battery costs $279.

Milwaukee M18 18-Gauge Double Cut Metal Shear costs $299.

Milwaukee M18 Fuel 1/2 in. Impact Wrench with Friction Ring costs $299.

Milwaukee M18 Fuel Hammer Drill and Impact Driver Combo Kit with 2 Batteries costs $399.

The Ridgid 18V 4.0 Ah MAX Output battery is a good choice. It gives you more power and runtime. It lasts up to three times longer than Ridgid's older battery. It's also compact and light. If you register it, you get free parts and service for life. This is a great deal.

You can get a free Ridgid battery with these tools:

Ridgid 18V Nuke SubCompact One-Handed Reciprocating Saw costs $139, which is $10 off.

Ridgid 18V Nuke SubCompact Cordless Drill/Driver Kit costs $139.

Ridgid 18V Nuke SubCompact Cordless Multi-Tool costs $149.

Ridgid 18V Nuke Cordless 4-1/2 in. Circular Saw costs $149.

Ridgid 18V Nuke SubCompact Cordless 2-Tool Combo Kit costs $219.

This is a great deal, no matter which brand you like. You can get a free battery with your tool at Home Depot.

Remember to check the deal before it ends.