KUNLUN40V 6.0Ah Battery for Ryobi 40V Battery, High Capacity 40-Volt Lithium Battery for RYOBI OP4040 OP40201OP4026 OP4030 OP4050 OP4050A OP4060 OP40601 OP40602 OP4060A OP4075A

Takes a bit to charge but it lasts longer than the original ryobi. I use it for lawn work mower weed eater and blower.

Far cheaper than the Ryobi one and works just as well. Great charging speed and lasts through trimming and blowing my .25 acre yard.

3-22 UPDATE: Amazon Replaced The Bad Kunlun 40V 6Ah Battery, Bad News: It Tested Just As BAD!Capacity Test Concluded Identical Results ~~VERY BAD~~ With The Same 63% Of Rated Capacity???_______============ If They Are This Bad When They Are Brand New Then What Would You Expect Them To Be Like In A Few Months? Much Better??? (OBVIOUSLY)???============_______Luna, From Kunlun, Responded To My Message When I Suggested That They Give All Of Their Customers A 50% Refund Due To The Low Capacity Issues, "By Asking Me To Return The Battery To Amazon For A Refund And Then They Would Have It Examined"? I Wonder Why They Just Do Not Pull One From Their Stock Since They All Seem To Test The Same???TESTED 40V 6.0AH BATTERY PACK WITH ELECTRONIC LOAD TO LEARN WHAT THE TRUE OUTPUT CAPACITY OF THIS BATTERY PACK IS AND IF IT IS A GOOD OR A BAD QUALITY PACK.FULLY CHARGED THE BATTERY PACK ON A RYOBI CHARGER, LET THE BATTERY REST FOR 1 HOUR THEN BEGAN THE DISCHARGE CAPACITY TEST WITH AN ELECTRONIC LOAD AT A GENTLE LOAD RATE OF 2.00 AMPS PER HOUR. THIS TEST SHOULD HAVE TAKEN ABOUT 3 HOURS WITH A 2 AMP LOAD IF IT HAD A 6.0 AH CAPACITY, BUT IT FINISHED IN ABOUT HALF OF THAT TIME SINCE THE CAPACITY WAS ONLY 3.8AH, OR 63% OF ITS ADVERTISED CAPACITY. THIS IS VERY VERY POOR.BEYOND THIS I ALSO SEE THAT THE BATTERY CELLS THAT WERE USED TO CONSTRUCT THIS BATTERY HAVE A MUCH HIGHER IR WHEN COMPARED WITH THE ORIGIONAL CELLS THAT RYOBI USES. THE HIGHER THE IR THE SLOWER THAT A CELL CAN CHARGE OR DISCHARGE, SO THESE CELLS CANNOT RELEASE AS MUCH ENERGY AS QUICKLY AS THE FACTORY PACK CAN, SO YOUR MACHINES WILL RUN SLOWER AND A LOWER OUTPUT POWER THAN THE FACTORY PACKS. THE PACK MAY ACTUALLY RUN YOUR MACHINES LONGER, RUN TIME, BUT THIS IS ONLY BECAUSE OF THE HIGHER IR OF THE PACK AND IT WILL TAKE LONGER TO RELEASE THE SAME AMOUNT OF ENERGY.IM RETURNING THIS ONE TO CONTINUE MY SEARCH TO FIND A BETTER VALUE BATTERY PACK, OR AT LEAST FIND ONE THAT WILL MEET IT'S ADVERTISED SPECIFICATIONS, YOU MAY WANT TO DO THE SAME.I ASKED THE SELLER SOME IMPORTANT QUESTIONS ABOUT THESE PACKS, BUT I AM STILL WAITING FOR THEIR RESPONSE.MORE LATER.Used in Lawn Mower, Leaf Blower, String Trimmer, Snow Blower, Chain Saw...

Seems to work fine

Just what I needed for that back up!!

This battery is a power house, it works longer than my original battery for my Ryobi battery lawnmower.

Almost threw my ryobi lawn mower away cause battery died. Picked this one up and it runs longer than it ever did.

This battery should be better than the Ryobi battery since it is a 6ah and the Ryobi is 5ah but it's not. First thing you notice is the Ryobi battery is heavier. After a full charge, it doesn't last as long in the mower.