If 50% battery level is recommended for long term storage, how much are AA/AAA battery charged to?
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50% is just a recommendation for lithium ion rechargeable batteries. It’s a balance between not storing it with high state of charge, which will reduce its shelf life, and have some buffer against self discharge all the way below safety levels. If you occasionally take them out for maintenance, you can leave them at 20-30%.
For AA and AAA batteries, the concept does not exist. Those are usually non-rechargeable batteries. They were never charged and are simply manufactured using active chemicals that produces charge. They are just consumables that will expire if stored unused. Discard them if they are past shelf life.
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