The batteries I have now are 1.2V NAH HR6 2300 mha it says that above. These are Energizer batteries from Walgreens. They were the heaviest battery they sell. I had good luck with Panasonic before these and Rayovac before that but none last very long.
The industrial batteries we used at work were rated for 8 to 10 years and they did but these are permanently in place and stay on charge all the time.
Japan and China have learned BAD habits from America those light weight batteries are full of white powder filler for a very tiny battery inside the AA case. Some 9v batteries have several tiny hearing aid batteries in series. There is so much dishonesty and deception these days, 2300ma sounds big and better than 2.3a to the average person.
I don't charge my batteries until they are dead. I wait until camera RED light comes ON and camera will not work. I learned 11 hours on the charger batteries get warm the last 1 hour so I charge them 10 hours and they do not get warm. The Energizer has worked good for 18 months now they won't hold a charge for 2 days and a full charge is only good for a few camera photos.
What is the different and which are best, NiCD or NiMH or NMH?
Video online shows how to revive batteries that will not charge. Connect 4 good fully charged AA batteries in series, use these 4 batteries to give 1 AA battery a 1 second charge, wait 5 seconds charge it again 1 second, do this 6 times. Wait 2 hours the battery will take a full charge. I have not tried this yet, batteries are junk like they are so its worth trying just to see if it works.