Milwaukee's 6th generation of Lithium-Ion batteries, the REDLITHIUM 2.0 and XC4.0 batteries, provide up to 2 times more run-time, 20 percent more power and over two times more recharges than standard Lithium-Ion batteries according to the manufacturer. These batteries work in extreme job-site conditions, operating cooler and performing in climates below 0 degrees F/-18 degrees C with fade free power. The new batteries are incremental purchase options and completely compatible with all M12 and M18 products by Milwaukee on the market.