Review on Ryobi 40V 6.0Ah Lithium-Ion Battery OP4050A Compatible With OP4040, OP4015, And More by Wayne Seba

Got it expecting to have a second battery just in case I needed one after mowing the front and backyard. Totally disappointed after breaking it in appropriately - it literally mowed 25% of my front yard before dying. The original battery that accompanied the mower, also a 6ah, (double in size) out performed this batt incredibly! The original battery cuts my front and backyard with no issues at all - I LOVE THE RYOBI MOWER - but if you’re looking for that "what if” onboard mower battery #2, take a pass on this short lifespan. (Also not a good choice for emergency preparedness)