Two for less than 20 dollars & up to 1200 charges. Will update this review if something happens but as of right now, they are amazing!

Usb rechargeable batteries. Duracel and energizer rechargeable i usually buy. Just recharge and start over.

These are total junk. Not worth buying. I'm trying a pair that doesn't use this and will see if they fare better. Skip this one.

When charging these, please set a timer, and don't leave the room of your house. Can't charge in standard battery chargers. These are a rip off, unless you're willing to sacrifice almost half of the usable charge.

Because they are liion, the output voltage is higher than nimh batteries, and thus the won't work in all applications. They last about 50% or less than alkaline equivalent.

I am an electrical engineer and the concept is great but the product quality and replacement support is not findable further wasting my time. Center post on 5 of 6 batteries had “collapsed”.