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Internet #206481601

Model #OP4050A

Store SKU #1001555935

Store SO SKU #1001555935

40V Lithium-Ion 5.0 Ah High Capacity Battery

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  • Works With All RYOBI 40-Volt Tools
  • Fade-Free Lithium-Ion Power
  • 5.0 Ah Battery for Increased Run Time
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Product Overview

If you have a large yard or need extra run time, the RYOBI 40V 5.0 Ah Battery is the perfect addition to your RYOBI 40-Volt collection. This 5.0 Ah battery gets 2.5X more runtime than the RYOBI 40V 2.0 Ah Compact Battery, while delivering the same fade-free power and performance. All RYOBI 40V batteries come with an on-board fuel gauge to display remaining runtime. This battery works with all RYOBI 40V tools and chargers. Backed by a 3-year warranty, there's never been a better time to consider cordless.
  • Works with all RYOBI 40-Volt tools and chargers
  • 2.5X more runtime than the RYOBI 40V 2.0 Ah compact battery
  • Fade-free lithium-ion power
  • On-board fuel gauge displays remaining runtime
  • Charges in 50-minutes or less with the RYOBI 40-Volt rapid charger (model # OP406A, internet SKU 312564301)
  • Charger sold separately
  • 3-year limited warranty

  • volt, amp, string trimmer, mower, battery, cordless, electric, gas, 40. ryobi

  • Click here for more information on Electronic Recycling Programs
  • California residents

Additional Resources

From the Manufacturer

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Used with Equipment TypeBlower,Chainsaw,Cultivator/ Tiller,Edgers,Generator,Hedge Trimmer,Mower,Powerhead,Push Mower,Snow Blower,String Trimmer,TrimmerBlower,Chainsaw,Edgers,Hedge Trimmer,Mower,Powerhead,Push Mower,Snow Blower,TrimmerBlower,Brush Cutter,Chainsaw,Cultivator/ Tiller,Edgers,Generator,Hedge Trimmer,Mower,Powerhead,Push Mower,Snow Blower,String Trimmer,TrimmerBlower,Chainsaw,Hedge Trimmer,Mower,Powerhead,Push Mower,Snow Blower,String Trimmer,Trimmer
Fits ModelsWorks with all RYOBI 40-Volt lithium-ion toolsWorks with all RYOBI 40-Volt lithium-ion toolsWorks with all RYOBI 40-Volt lithium-ion toolsWorks with most RYOBI 40-Volt lithium-ion tools
Battery Amp Hours2.
Voltage (volts)40 V40 V40 V40 V
Part TypeCordless BatteryCordless BatteryCordless BatteryCordless Battery
View ProductView ProductView ProductView Product



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Battery Amp Hours
Fits Brands
RYOBI 40-Volt
Fits Models
Works with all RYOBI 40-Volt lithium-ion tools
Number of Batteries Included
Part Type
Cordless Battery
Used with Equipment Type
Blower,Chainsaw,Edgers,Hedge Trimmer,Mower,Powerhead,Push Mower,Snow Blower,Trimmer
Voltage (volts)
40 V

Warranty / Certifications

Manufacturer Warranty
3-Year Limited Warranty

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 4.4
    out of 2,703 reviews
  • 85%recommend this product
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Showing 1-10 of 2,703 reviews
Good News/Bad News - and a word of caution
Bought op4050 (5 amp) model because my 2-year old 2.6 amp battery would only run chainsaw for 15 minutes. Charged my new battery overnight and it ran for... 8 minutes! Good news is that warranty 800 operator was friendly and is shipping me a new battery. Bad news is still have to wait two more weeks for a decent battery. Date code incidated battery was produced 15 months ago. This again confirms lessons I have painfully learned about Ryobi batteries. If you buy from anyone other than Home Depot, Ryobi WILL NOT honor a warranty. It sucks how expensive these batteries are, but bite the bullet, but from Depot, and keep your receipt and order number for the full three years.
    5 found this review helpful
    battery doesn't hold the charge after 8 month of light use.
    i have leaf blower, hedge trimmer, chainsaw and purchased additional 5amp battery. i used them about 3 times in the 8 months. The 2 battery no longer hold the charge. i can't trust them to buy another battery. all tool go into crawl space. DON'T BUY THEIR BATTERY OPERATE TOOLS.
    Response from RYOBIOutdoorsDec 3, 2020
    Hello, hoangnguy9 - We are so sorry that you're having battery issues! Our batteries are backed by a 3-year limited warranty. And we'd be happy to speak with you and see about turning this experience around. If you would, will you please email us at reviews@ryobitools.com? RYOBIOutdoorTools
      3 found this review helpful
      BATTERY NEEDS IMPROVEMENT such as thermal management ,over load protection
      I used this battery for about 2 years for lawn mower and cutting tree branches. Good and strong power. Easy to recharge and satisfactory amount of time last long. After I used with 14 in chainsaw and cut the 7 inchs tree root, battery was unable to recharge and defective . I don't have problem with 4-5 inches tree branches.
        Ryobi battery problem
        I have 4 tools, leaf blower, weed trimmer, leaf vac, and chainsaw that run off of this type of battery, Within 1-2 years of purchasing these tools/batteries online and some from the home depot store, only one (1) of the four (4) batteries work good, two have failed completly, and 1 only works 2-3min now, the only good one lasts me about 15min. There’s no reason why these batteries should have failed so quickly. Ryobi need to fix their faulty batteries.
        Response from RYOBIOutdoorsOct 6, 2020
        Hello, shad - We are disappointed to hear that your batteries have stopped working! Our batteries are covered under a 3-year limited warranty, so we expect them to last longer! If you would, please reach out to us at reviews@ryobitools.com. We would love to continue this conversation. RYOBIOutdoorTools
          • Recommended
          13 found this review helpful
          Glad to have it.
          Glad to have it. Get more time to do my work because of shorter time to charge.
          • Verified Purchase
          • Recommended
          i have the Ryobi lawn mower, weed eater and blower all three batteries absolutely suck. All 3 can't keep a charge. The lights will say they're fully charge put them on the equipment and last 5 minutes (if lucky) 1 of them are the 3Ah and 1 is 4Ah and the other 5Ah. They equally suck.
          Response from RYOBIOutdoorsJul 25, 2020
          Hello, Randy - We are so sorry that you're having issues with all three batteries! We expect the batteries to provide you with years of reliable performance, which is why they're backed by a 3-year limited warranty. If you would, please reach out to us at reviews@ryobitools.com. We'd like to learn more, so we can try and move this experience in a better direction. RYOBIOutdoorTools
            14 found this review helpful
            RYOBI is the best product out there. Large selection of 40v power tools. I hope they can offer a...
            RYOBI is the best product out there. Large selection of 40v power tools. I hope they can offer a combo blower & vacuum unit. A trade in/upgrade option would be great.
            • Verified Purchase
            • Recommended
            1 found this review helpful
            This battery brings my lawnmower to life. And the backup...
            This battery brings my lawnmower to life. And the backup too.
            • Verified Purchase
            I lacked about 20 minutes of getting my entire yard done. Bought an extra battery and now have en...
            I lacked about 20 minutes of getting my entire yard done. Bought an extra battery and now have enough power to do it all in one try. Would sure recommend the Ryobi battery mower to any and all that are thinking about getting one.
            • Verified Purchase
            • Recommended
            4 found this review helpful
            Long Lasting power. Lot's of Power.
            [This review was collected as part of a promotion.] I have the 20" Ryobe 40v Battery powered Mower and wow am I impressed at the raw power from the 40v battery. My lot is 120' X 85' and the battery lasts until the end with a pinch of power to go. I should mention that my mower is the Self Propelled model. Recharging the battery takes about 2.5hrs and is easy to put into the charger. I have taken a break between my front yard and my back, gave the battery a charge during that time and that extra charge inabled me to even cut my neighbors front yard. A good friend has a few 40v Ryobe yard tools. In the weedwaker it has power to cut even thick grass and the Blower puts out intense power. At the shop I've seen it last for a long time before needing a recharge. I also have a line up of Ryobe 18v Drills and equipment, the 40v blows it away, yet I'm very happy with my Ryobe battery tools. Sure there are several brands to choose from, but using Ryobe Tools for a few years, it's among the best you can buy. You won't be dissapionted when you buy and anything that uses the 40v battery will amaze you with the power and long battery life. I put all the Ryobe lineup as Recommend to Buy. The 40v system, absoluitely! You won't return it, you'll love it.
            • Verified Purchase
            • Recommended
            Showing 1-10 of 2,703 reviews