Review on ELEFLY 40V 6.0Ah OP4050A Replacement For Ryobi 40V Lithium Battery OP4015 OP4026 OP40201 OP40261 OP4030 OP4040 OP40401 OP4050 OP40501 OP40601 40 Volt Cordless Tool Battery by Collin Donahue

UPDATE AFTER 1.5YRS: the battery is dead, won't charge anymore and nothing lights up when you try to check the fuel gauge. Had 2 seasons of light usage on it. Lowered star rating from 5 to 3. Original review belowFinally, this is the best replacement battery to get for Ryobi mower! MUCH longer life than the original, I mowed tall grass for >30 minutes on a charge, the old batteries would have been dead in half that time. I have tried other off-brand replacements without luck, but this one is it! Very satisfied.