40V 6500mAh Lithium Battery for Ryobi Power Tools - Compatible with OP4015/OP4040/OP4026A/OP40201/OP4050A/OP40261/OP4030/OP40401/OP4060 - Replacement for Ryobi 40V Cordless Lawn Mower/Leaf Blower/Chainsaw/Trimmer (Includes Charger Compatibility)

I've only had this for a few weeks, but it is doing well. My old batteries couldn't make it through mowing both my back and front yards--even when the grass was low--and my yard is not that big. The new battery has worked without fail, and the lawns are currently very thick and lush (I had to empty the catcher several time) and the battery still had plenty of power.The battery was much cheaper than the Ryobi batteries I can find at Home Depot, so the value for money is spot on.