Rechargeable 9v Batteries USB 9 Volt Battery for Smoke Alarms 3700 mWh 9v Battery with 2-in-1 USB-C Charging Cable and LED Charge Indicator, 2-Pack

Have you ever been listening to your portable radio and the volume gets lower and lower and poof it is dead. Nothing can be worse then listening to your favorite sports team and right at the crucial moment, hissss, poof and it is gone. Not fun. During an emergency you are listening to the local news and weather during a storm and the battery goes dead, not only a local emergency but one for yourself not knowing what is going on. I think we have been al theer before. I live in South Florida and a radio can be your lifeline during hurricane season. We think we are stocked up on the needed 9 volt batteries and oops, no we weren't. We had all the other batteries stocked up but the little square 9 Volt batteries, nope. Lesson Learned. Well fear not, these little guys are fully rechargeable, no more oops I forgot. If you noticed during an emergency the 9 volt batteries usually are gone first at your local store. I bought the pack and they have been a life saver, not only for my radios, but even my small test meters that take 9 volt batteries. What a pain to have the test meter die right in the middle of a repair. These little guys even outlast the Alkaline batteries. They also charge quite fast. I have even used a solar charger during an emergency to recharge these batteries. These batteries are great and can be recharged many times over, fully outlasting all the top copper brand bunny batteries. Stock up on these and visit the Cardiens shop on Amazon for all your emergency battery needs. They are all rechargeable. These are Not your grandfather's batteries. Their Better!!!

3 batteries worked great, one was DOA after one use..... Will not recharge. Plan to call company next week

Works great in a metal detector that takes two 9V batteries. Also works great in an Ethernet/phone line tester. Easily recharge. Lighted notification of when the battery is fully charged. Definitely worth buying vs buying 9V batteries every time you need a new one. They also weigh a lot less than traditional 9V.

Works great

Decided to give these a try for a lifepod safe since that's about the only thing we have that uses 9v batteries. We have two of the lifepods and replaced the regular 9v batteries that were in them for about the last 2yrs. The standard 9v batteries were pretty much dead however they had enough juice left to enter the code one more time to open the pods one more time. Ordered these in middle of March, charged them up and installed. Have only opened the pods twice since that time so barely any use with the electronic key pad and today 4/29 went to open one of the pods and it was completely dead so had to find the key for it to get in. Decided to check the 2nd pod and completely dead as well as the first. Batteries didn't last 2mo with barely any use so can't recommend these batteries. Maybe just a bad set but the standard 9v random brand name that was in there before lasted over 2yrs without issue and these crapped out in less than 2mo. Not sure why truthfully as most reviews look good but can't risk trusting these if it came down to needing what's inside the lifepods in an emergency.

These are perfect! I need to change my 9-Volt batteries quite regularly and with these I'm saving a lot of money. I just take them out and recharge them. It is very nice that they charge using USB-C since I have a lot of USB-C chargers. However, it came with it's own USB-A to dual USB-C cable! How nice is that! Battery life has been great so far and it works just like a regular 9-Volt battery. I wish I bought it sooner!

Very good, with the caveat that the voltage regulator is noisy enough that an AM radio might pick up the static from the battery and not any radio signals if that's your use case.

So far so good. Recharges fast, works fine. They are lighter than I thought they would be. They seem as tough or tougher than a regular 9v, despite being plastic. I looked at a lot of rechargeable 9v batteries since I couldn’t find a single one that was a “name brand” and these have met my expectations so far. I’m happy with my choice.