If you're mixing Makita and DeWalt batteries, you can grab an adapter that converts your 20V DeWalt battery to something that can be used with your Makita 18V tools on Amazon for $15.98.

Unlike some unreliable DeWalt-to-Makita battery adapters, the DeWalt Powershift XR Flexvolt adapter safely allows these smaller batteries to be added to Powershift tools for additional use time.

The universal accessory adapter ensures compatibility with ... seeking efficiency and reliability in their tools. The DeWALT 20V MAX XR Battery offers reliable, long-lasting power for a range ...