I saw this old post about it on this subreddit - https://www.reddit.com/r/AAMasterRace/comments/cskr2r/aa_to_usb_power_banks/

It is old and archived so I can't new comment on it. I sort of love Rechargeable AA batteries a lot, like it feels so satisfying for me for some reason to take out batteries from devices and charging them, sort of like feeding your hungry pets food, after long day, sometimes I pat them and say good work baby, time for food. It is way better than plugging device (like rechargeable flashlights) in USB to charge the device for some reason to me, I dunno why.

https://www.amazon.com/Enevolt-Rechargeable-Batteries-Operated-Portable/dp/B07NHWF73W

I am thinking of buying this and putting Ikea's Ladda (White 2450 mAh) in them, and probably take out batteries and charge in my smart charger everyday. My friend was explaining like modern power banks have Lithium Polymer batteries in them and they are much higher capacity/denser compared to AA and are thus much sleeker. and have new modern stuff like USB C port, etc. I am personally not even sure if modern power banks have some features like controlling charge current so to not damage device (phones) or is Lithium more efficient than AA for charging, etc.

I dunno if this Enevolt Power Bank has design issues but it has many review with 1 star and people said it doesn't work or sucks juice/power out of phone after it reaches 100% charge, etc.

Any tips, advice or any other premade AA Power Bank I can purchase? (I don't want to solder parts and make one myself)

Thanks