https://www.homedepot.com/p/Milwauk...-Ah-Battery-Pack-2505-20-48-11-2450/339217168 Milwaukee M12 Fuel 12V Lithium-Ion Brushless Cordless 4-in-1 Installation 3/8" Drill Driver Kit + Milwaukee M12 XC High Output 5.0 Ah Battery Pack (2505-20-48-11-2450) on sale for $159.97. Shipping is free.