【Upgrade】 40V 4.0Ah Replacement Battery for Kobalt 40V MAX 2540C-06 High Capacity Lithium-ion Battery KB440-03 KB2540C-06 KB640-03 KB240-06 for Cordless Power Tools

I used this battery once for my leaf blower. After that I couldn't get it to charge. I have 3 chargers and tried it with all 3, and even charged another Kobalt battery to make sure it wasn't the charger. I'm very disappointed with this product and I have to say I have never had a problem with Amazon before. Because I purchased it in May and because I have 2 other batteries, I didn't discovery it wouldn't charge until the end of August. I found out that it was past the amount of time I could return it, but after a couple of months found out that I didn't write a review I decided to. Don't buy this brand of battery. Spend a little more and get a name brand. I had to put one star on this because it wouldn't let me submit it with no stars (as I was orginally going to do).I would like to submit a new review. I am very impressed with CaliHutt. They had read my review and contacted me through Amazon, to ask about the product. Without me asking they send me a new battery. I'm happy to say that I used it, and more importantly I recharged it. It works great. I can't say enough nice things about this company, especially since I personally never contacted them, nor requested a replacement. They did that all on their own.

Great battery life

Lasted a long time before needing charged again.

Good quality. Last longer than the original.

The battery seems to be working fine. Would recommend as a replacement battery. A good value for the money.

The battery I ordered from Amazon is working perfectly.

This battery failed after about two months. All four lights claimed it was fully charged, but it would run for one second and stop. Over and over again. Calihutt refunded me quickly and without any problems.

I bought this because it had the same stars as the Kobalt brand at a better price however after using it three times it definitely charges down quicker which makes me skeptical about its longevity. We'll see when leaf season comes.