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Home Depot [homedepot.com] has the RYOBI ONE+ 18V HIGH PERFORMANCE Lithium-Ion 4.0 Ah Battery (2-Pack) with 18V Lithium-Ion Charger on sale for $ 79. These are the high performance batteries.
Currently over 500 in stock.
RYOBI ONE+ 18V HIGH PERFORMANCE Lithium-Ion 4.0 Ah Battery (2-Pack) with 18V Lithium-Ion Charger $79 @ Home Depot