I bought these rechargeable batteries for my husband's flashlight.His flashlight is essential at work specially when working graveyard.His Smith & Wesson flashlight uses two Energizer batteries 123 (3.0V) but these are the perfect replacement. They last a super long time. He hasn't recharged them in 3 weeks. I already bought him another set as a back up!
Verified purchase: Yes | Condition: New
I searched for a good set of batteries that won't fail in a short time, hence I went with a brand name like Nitecore. While some may ask how do I know Nitecore is good, well they have a reputation to uphold rather than some unknown company that you know nothing about, so I based by decision on that alone. Time will tell, but I am more confident with these than the unknown brands.
Verified purchase: Yes | Condition: New
I purchased these RCR123A rechargeable lithium ion batteries to upgrade a high end flashlight with expensive non rechargeable lithium batteries to an extremely nice flashlight with the best thing going. The light is just as bright as it was now and I can use it as much as i want daily without getting upset at the cost of keeping expensive, disposable batteries on hand.
Verified purchase: Yes | Condition: New
Nitecore rechargeable batteries #16340 NL166 3.8 v make an excellent replacement for any  123A non-chargeable battery , works very well .Have been using them for years in 500 to 2100 lumen flashlights
Verified purchase: Yes | Condition: New
I received 4 batteries and put them through the test. I have an Opus BT-C3100 Charger, Rev V2.2. I ran them through the charge - Test mode to see what the actual mah was. I was pleased when all 4 rated higher than listed. 1) 685mah; 2) 713mah; 3) 735mah; 4) 695mah. The usual "Blue" 16340's rated at 1200mah were coming at ~325mah on the high end. Bottom line - Worth the extra money to get the Nitecore. I use these in my weapon mounted light for duty. I will be buying more. Deputy Dave
Verified purchase: Yes | Condition: New
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