Worx WA3578 - PowerShare 20V 4.0Ah, Lithium Ion High Capacity Battery, Orange and Black

Lasts for almost an hour with my Worx chainsaw. Charges pretty fast and has unstoppable power.

With all the junk that's out there in the world I didn't have high hopes for this battery. I bought it as an xmas gift last December and has been used all summer long. It really does last a long time and no detectable loss in performance. Slots in the Worx tools nicely, positive click when its seated. Really cant find anything different about it when compared to the worx branded batteries.

I have a Worx string trimmer that came with a 2AH battery. That original battery always ran out about 80% through using it. This 4AH battery easily lasts the entire job, and I still have the 2AH one in reserve. It seems to be a pretty well-made pack, and the cells inside are hopefully quality and long-lifetime.It was pretty expensive, but that's the way these power tool companies work now. Cheap tools, expensive batteries.SPECIAL NOTE: I tried a cheap "6AH" Chinese knock-off no-name battery before I bought the name-brand one, and it wouldn't even charge with the official charger. When I took it apart and tested the 18650 batteries inside the knockoff Chinese battery, they corresponded to an overall battery pack that had about 2.5AH (not 6AH), so even if it had worked, it wouldn't have been worth the price, as it was about the price of a 2 or 3AH battery. Also, the reason it wouldn't charge was that the battery management system board was dead on arrival. Long story short, I do NOT recommend buying the knockoffs. They overstate their capacity, they use mediocre cells, the electronics in them are cheap and unreliable, and they are probably dangerous as a result. If you are strapped for cash, you might as well just buy the name-brand in a "lower" capacity.

Well unlike the knockoff brands it holds it's charge very well,does a very good job.

I was skeptical but my goodness this is a night and day difference. I do not know if these are the genuine article or not. But they look like the genuine article and they are very cheap also they function incredibly well. My battery life has increased by about 70 to 80% without any doubts. Power share works perfectly for both charging and Tool use. Honestly I was expecting to get a couple of junk batteries that barely function but honestly these are fantastic for the price. I plan on buying another pair already.

It has a lot more capacity than the smaller 2 Ah ones. Plus when you are done, and want to recharge it, you don't get the red light which means wait an hour until it cools down. It takes a new charge right after using up the first charge, no red light. I have 2 of the 4 Ah ones now for my several Worx tools, including a chainsaw.

Good battery for my worx tools last long on every charge.

Super duradera y carga gapida