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Amazon [amazon.com] has 2-Pack CRAFTSMAN V20 4Ah Lithium Ion Power Tool Battery (CMCB204-2) on sale for $79.00. Shipping is free.

From Merchant’s Product Page:[LIST][*]Specs:[LIST][*]Voltage: 20V[*]Capacity: 4.0Ah per battery[*]Chemistry: Lithium Ion[*]Battery weight: 1.4 lbs each[*]Dimensions (each battery): 7.86″ H × 6.46″ W × 3.06″ D