Just noticed Home Depot is running some pretty good sales on batteries. 50% off on some, and some solid BOGOs like this one:
RYOBI ONE+ 18V Lithium-Ion 2.0 Ah Compact Battery (2-Pack) with 6-Port Charger PBP2006-PCG006 - The Home Depot
RYOBI introduces the 18V ONE+ Lithium-Ion 2.0 Ah Compact Battery (2-Pack) with 6-Port Charger. These RYOBI ONE+ 18V Lithium-Ion 2.0 Ah batteries provide up to 1.5X more runtime compared to our 1.5 Ah standard Lithium-ion battery. They are compatible with over 260 18V ONE+ tools to power you...
www.homedepot.com