First Gen iPhone Battery Life?

i'm curious if still using first generation iphone? if so, how long battery last compared when bought new?

seems me battery life on iphone , ipad has been amazing on time, opposed laptop batteries. i've had laptops after 2 years can hold charge 15 minutes, 2 year old ipad still holds significant charge, iphone. yet, i'm wondering how long can hold out, seeing first gen iphone battery after 4 or 5 years might give answer.

 

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