Ryobi USB Lithium-Ion 2.0 Ah Rechargeable Battery 4-Pack for $40 + free shipping

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This four-pack of Ryobi USB Lithium 2.0 Ah batteries is down to just $40, putting them at $10 apiece. You'd pay more than that for just two batteries at Walmart. Each battery can power RYOBI's USB Lithium tools or double as a charger for a mobile device. Shipping is free, too.  Buy Now at Home Depot Features Includes four USB Lithium 2.0 Ah rechargeable batteries Combined capacity of 8 amp hours Compatible with the RYOBI USB Lithium system Can power a USB Lithium tool or charge a mobile device