CR2 Rechargeable Batteries and Charger, 450mAh 3.7V CR2 Battery, 8 Pack RCR2 Rechargeable Batteries for Golf rangefinder, Telescope, Electric Toys, Smoke Alarm and More(Not for Arlo Camera,C Battery)

USB is very hidden Works very well.

Good value

These are great for keeping a few charged up and ready to go to replace in my camera doorbell. But they don’t seem to last as long as a lithium battery from energizer or Duracell. I can get about 4 to 6 weeks with one of those and one of these rechargeable seems to last only three weeks maybe a bit more.

This charger uses a USB plug in for charging witch gives you multiple options from a wall charge to a battery backup or power station to charge with.

I’ve lost nearly $200 a year in batteries for my analog cámaras that take CR2. They aren’t cheap to buy, averaging $10-22USD depending on the stores prices, needless to say way too much money for batteries. I couldn’t believe my eyes when I discovered this rechargeable CR2 unit. It has saved me a lot of money. Highly recommended.

This is a excellent item to buy.

It does not charge the batteries i have and the batteries that came with it aren't the size I need, they are to small. I needed rcr123a size batteries. This will not even charge my batteries when it says it charges all.

I bought these batteries to power a camera. I thought the slightly higher voltage would not be an issue. However the camera fails to work, I guess some sort of over voltage protection cuts in as there is no response to controls, display may or may not work. Swapping back to a standard battery results in normal operation.A normal CR2 (non-rechargeable) is rated at 3V and will be a little over that when new. These batteries are rated at 3.7V which I thought would be OK, but they go up to 4.2V when fully charged, which is getting significantly higher than 3V.Otherwise the batteries arrived in good condition, the charger worked nicely. I will not be able to give any longevity or cycle count reviews.