Ryobi ONE+ 18V Lithium-Ion 2.0Ah & 4.0Ah Batteries w/Charger + Bonus Tool
This kit includes a 4Ah lithium battery, a 2Ah lithium battery, and a charger. It has extended your productivity runtime up to 3X more and It features a high visibility LED fuel gauge that indicates remaining runtime. The price drops from $203.94 to $99 w/ free shipping. Also, you can select a bonus tool from the product page under "Free Gift With Purchase".