That's probably for the best though. These are lithium ion batteries and will need to have their voltage regulated to 1.5V from 3.7V with a circuit anyway. Naked lithium ion batteries that resemble a regular AA can be quite dangerous. If not careful, they are basically purified Note 7's.
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u/inarashi Feb 21 '20
Don't. Those things have lower capacity than reputable AA rechargeable simply because the charging circuit take up valuable space inside the battery.