WORXWA3578 - PowerShare 20V 4.0Ah, Lithium Ion High Capacity Battery, Orange and Black

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.

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

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.

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

Super duradera y carga gapida

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.

And ready to store more for your convenient use. I have about decided that this battery is about all the work I want to do with a WORX tool - in this case a chainsaw. By the time this battery gives out, so am I and it's time to quit anyway. Since they have a variety of battery capacities, base the size you buy (2A, 4A, 6A, etc.) on your age and the amount of time you want to work. That way, when you flop out in the easy chair after a round of yardwork you can tell the wife "I worked until the battery ran out.... it's recharging!" and you can recharge with cold adult beverage with a true metric to judge your work by. Inescapable logic! Just don't let you wife be ordering any extra batteries or that high speed charger thingy they sell. If you convert all your yard equipment over to WORX you can even use it as a bargaining tool! "Honey, I'm gona weedeat the yard until the battery runs out, then I have to call it....." You can tell your buddies at 1:00pm, "Hey, I gotta weedeat the yard first and the battery lasts about 45 minutes, so I can make that 2:00 pm tee time!"Thanx Worx!

Yeah, WORX-brand batteries are expensive. But the "compatible" replacements you see here on Amazon are junk. Most aren't anywhere near the stated capacity, and degrade to uselessness in just a few charge cycles. Better to pay the price and get the OEM product. This 4.0 Ah battery is great, buy it.