To update this thread - I put in a new battery and all works fine now.
I suspect it was one of three things:
A) The old battery died just by coincidence when replacing the motherboard
B) I somehow damaged the battery while replacing the motherboard
C) There was some sort of incompatibility between the old battery and the new REV 3.0 B motherboard.
My money is on C. A is highly unlikely and while B is possible - I was being very careful.
It was just odd that everything showed good with the old battery, it just wouldn't switch over to it.
Anyway...
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Asus VivoBook F510UA-AH51 won't run on battery after motherboard replacement
I'm working on my sister's laptop: Asus VivoBook F510UA-AH51 - The motherboard died so I replaced it.
The original board was:
ASUS X510UNR REV 3.0 A
The replacement board is:
ASUS X510UNR REV 3.0 B (identical except B vs A - I couldn't find an A board anywhere. Visually they are identical.)
It boots right up on the replaced motherboard and everything works fine on the new motherboard - but it won't run off battery. When I disconnect the charger it immediately dies. When I plug it back in and reboot the system - it still shows the battery at...1 Photo
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