Biswaye 4.0Ah 20V Lithium Battery LBXR20 Compatible with Black and Decker 20V Max Battery LBXR2520 LBXR2020 LB2X3020 LBX20 LB2X4020 & LST522 LHT2220 LST300 20-Volt Max Cordless Power Tools (2-Pack)

Not sure about longevity. Just got the batteries. They are charging in my vac. So far so good. This are easily half the cost of one brand specific (Black & Decker) batteries. If they're reliable and last quite a while, they'll be a great deal....two for less than the price of one! If they only last half as long as the brand specific one, they're still a good deal. It's great to have two charged up batteries in case one doesn't last long enough to vac the whole house at one time.

Love the new batteries. They do take quite a while to charge. Like that I got two for a great price.

Seem to be working well. The only issue I encountered was that the new replacement batteries didn't fit very well with the original B&D charger. It appeared to be the new batteries were just a bit too wide, but with a little bit of pressure, I got them on. Not as difficult to attach them to the weed eater. Batteries had a nice, strong charge, and worked well as replacemnets.

They shipped quickly and the new batteries last long enough to get some work done!

As expected

These are priced well, and fit my Black and Decker weed eater, but seriously, they don't hold enough power for most jobs. Next time I'll go with larger capacity battery packs

I thought the battery was not as all the hype. I been having them about a year , they don't even take a charge. I even purchased a biswaye charger. Both the B&D battery flash red and the Biswaye battery flash red on the charger.

Most of these batteries I've purchased work well enough, but they're really hit or miss on how much power they put out and how long they last. Even when charged to full on the exact same charger, used in the exact same device, and used to do the exact same task, they aren't consistent in power output and how long they last before empty. For example, some will put out the max (20V), some will put out a bit less (~15V), and some will hardly put out anything (~5V). Some will last ~45 minutes, some ~30 minutes, some <~20 minutes, all under the exact some usage conditions. I'd expect minor variations of maybe 1-2V and maybe a few minutes charge length, but it's insane to see massive differences of >25%! I think some better quality control is needed when producing these.