40V Battery and Charger Kit 4.0 Ah Lithium-Ion Battery Set OEM OP4040 + OP403A

I've purchased 4 off brand 6ah batteries. All died within a year. My original Ryobi 4ah is going strong 4 years later. Power doesn't sag much when put on a heavy load, ex mowing tall wet grass. It does have a overheat protection built in to prevent damage. I have 3 of these Ryobi batteries now and won't purchase other brands anymore. Live and learn. These cost more than cheap off brand batteries, but they pay for themselves by lasting years at a time and having a high steady output. It may be tempting to get 2x 6ah batteries for the price of this one, but don't do it! They have power sags and fail quickly. Save yourself money and buy Ryobi batteries.

Buen producto, no traía su caja original pero ha funcionado sin problema.

This battery charged up fine and works great in my mower. It powered the mower (through thick tall grass) for about an hour. The charger is very lightweight. There isn't a way to mount it the way that, for example, Dewalt chargers have holes that allow you to mount them on screws to a wall. The battery is heavy though, and significantly larger than the charger, so maybe that's why they don't encourage wall mounting. The battery gets very hot when in use, but I was able to touch it with bare hands after mowing for an hour in 100 degree weather. It cooled quickly once back inside. Not sure what else to say about a battery and charger but this was my first time using Ryobi anything. I got a Ryobi mower with no battery from my brother, so I bought this battery and charger. I've tended toward Dewalt and Craftsman over Ryobi for power tools, but I am super impressed with the Ryobi mower. Never used anything but gas operated lawn appliances in the past. The power was way more than I expected for a battery powered mower. It chewed through tall grass better than my last gas push mower. Even my gas riding mower slows down with this grass and the Ryobi electric mower was fine. So overall, I'm very impressed with the power this brand packs. I won't hesitate to buy more tools and batteries from Ryobi going forward.

Knock-off brands of these batteries are cheaper but not always reliable. I have a Ryobi lawn mower I use these batteries for. It came with a 6 amp hour battery which is considerably larger and heavier than the 4 amp hour shown here. For that difference in size and weight it runs maybe 10 minutes longer. So I opted for the 4 amp hour battery. I need to be able to mow for two hours or so and three of these allow that (if I put the first empty battery back in the charger right away so it has time to recharge so I can reuse it without interruption).

product arrived earlier than expected an in great condition very satisfied foe sure, exactly as i had ordered