RYOBI40V Battery and Charger Kit 4.0 Ah Lithium-Ion Battery Set OEM OP4040 + OP403A

Do not waste your money on any batteries especially lithium ion that state that they are direct replacements for OEM quality. Just get the OEM one. Yeah you're going to pay more but in the long run you're going to save lots. This is an oem Ryobi battery and it's rating is correct. You can read many posts on many other brands of batteries that claim to be higher amperage or even the same amperage as the OEM one. You will see that most of that is just false advertising. This one works as described. Appears to be exact OEM and even lasts just as long as the original did with the same charging times the same heat load and comes with a charger. Been using for a few months now every weekend and it's working great.

Perfect! Works great

This battery works very well and last a long time. I have several Ryobi products which allows me to use it on multiple yard tools.

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.

The way the charger fits onto the battery is terrible. The cord placement is poorly thought out. No indicator light.

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).

Purchased this instead of buying from Home Depot! Better deal and works just as good. Works perfect for our ryobi tools. But I do feel like the battery life could last a little longer. End up going through 2 or 3 batteries each time I mow. Overall happy with the purchase! Charging time is a little slow though but not a big deal.

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.