given that these batteries last for decades, I recommend purchasing only the highest quality Japan-sourced LSD batteries from reputable U.S. retailers such as Amazon, NewEgg, and Costco. There are surely other reliable retailers but these are three that I’m confident will sell batteries ...
The biggest enemy is heat, when you recharge your AA or AAA batteries, it gets heated up, this will greatly reduce the battery cycle and lifespan. In the end, you can get the best quality rechargeable battery but without proper care, it will degrade faster than the cheaper Ikea LADDA bat...