It takes 2 × AA: a everyday aa battery, the same size as an AA.
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You’ll need: Nothing
Slide or unscrew the little battery door.
Take out the old one and put the new one in matching the “+” mark.
Close the door and switch it on.
Use AA lithium batteries. Blink says alkaline and rechargeable AAs won’t last.
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A new battery usually lasts about 2 years in this device.
That’s around November 2028.
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It takes 2 × AA, a everyday aa battery.
Yes. LR6, E91, MN1500 are the same battery with other names.
Usually about 2 years, depending on how much you use it. Most devices warn you when it gets low.