Well, almost 6mm. It’s 56/57mm
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I wonder if they changed the product:
Here it says 66mm should be ok (same link scroll below)
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Right!! It make sense!! Mine is smaller!! 
Sadly, I can’t find it on Amazon Europe. Hope my experience will help L5 European owners to avoid my mistake! 
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Hi guys , does this charger work well for the librem 5 battery as i have a spare battery and normal battery life is pretty grim for my mobile usage and being able to charge the spare out of phone would be a bonus
it says output 4.35 volt on the correct width charger link in amazon , is this a problem for charging a spare battery designed for 4.2 volt
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yes as far as I’ve used it works.
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