Bought these off FB marketplace. Both are 40v 4aH batteries, but look different. One charger has a USB port? Left battery is 0P40401. Right battery is 0P40404. What's the difference? : r/ryobi
RYOBI's 4-pack 18V ONE+ batteries include two 4Ah & two 2Ah for $149, more from $99 - 9to5Toys
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RYOBI ONE+ 18V HIGH PERFORMANCE Lithium-Ion 4.0 Ah Battery (2-Pack) PBP2004 - The Home Depot
RYOBI ONE+ 18V HIGH PERFORMANCE Lithium-Ion 4.0 Ah Battery (2-Pack) PBP2004 - The Home Depot
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Ryobi 18v 4Ah Batteries - 2 Pack - Brand New for Sale in Bothell, WA - OfferUp
Power Tools Batteries for Ryobi 18V 4Ah Battery Replacement - China Power Tools Battery and Ryobi 18V 4Ah Battery Replacement price | Made-in-China.com