They are supposed to be lithium rechargeable and they cannot be changed...well maybe they can i have to read the manual again. It has a solar cell on it. ..so I put the helmet in the window all day and when I came home I put it on and while looking at a light bulb and turned the bulb on ...it darkened and I did turn it down darker too...tried that a while and it seems to work fine...maybe it needed a recharge...I'll go test.




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...the rechargable lithium-ion kind.
