Forum: Off Topic CR2 battery Problem

von Lernend B. (Company: KUKE Electronics CO., Limited) (lernend05)

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I recently purchased the Canon Rebel T6 kit with 18-55mm lens and the 
Canon Custom Accessory Pack, which included a lens cleaning kit, a UV 
filter and 2 3V Lithium CR2 batteries.
I have read the blog:

I have never seen this size battery before. Can anyone tell me what 
they're used for?
thanks in advance

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