Rakuten.com with CPO Outlets has the DeWalt Flexvolt 20-Volt/60-Volt MAX 12.0 Ah Battery Pack (DCB612) for $210 - 15% off with coupon code SAVE15 [Exp 9/3] = $179 with free shipping. Compatible with 20V MAX, 60V MAX, and 120V MAX tools and has 12.0 Ah capacity for maximum runtime.