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Why 13.8v? Curious. (1 reply)

GG
3 weeks ago
GG 3 weeks ago

I've wondered about this since the days of CB back in the (ahem, late 70s). Equipment made for use in 12v cars and radio power supplies are rated at 13.8v.  Why not 12v  ?

Chris - M7CRM
3 weeks ago
Chris - M7CRM 3 weeks ago

I think it is to overcome a bit of internal resistance, a bit like when you charge a car battery you need to charge it at a rate > 12V to get it up to 12V.

If you test a new 1.2V battery, you will always find it a little over, I have just tested on and it's 1.28V.

 

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