Hi @John_Haggerty this is from someone who authored a 90 post long thread about this issue 
We have to separate the two things out - Laptop Battery 100% charged and BIOS Battery 100% charged (Yes, this is not ideal specially since there is no fancy indicator in the OS that says how much the BOIS battery is charged). The Framework RTC/CMOS battery is rechargable as has been established elsewhere and will last only 21 days without being plugged in (irrespective on main battery charge %)
General rules of thumb I’ve come to accept
- The BIOS battery can take upto 48 hours to charge fully and it only charges when the laptop is plugged in
- The BIOS battery will completely discharge (in theory) if the laptop is left unplugged for around 20-21 days (in new condition, those numbers will go down eventually but someone calculated a lifetime of 6 years for it, though other people have had to replace it 8 to 10 months in)
Now, there are other issues possible which may indicate a dodgy motherboard (specifically a dodgy RTC battery soldering issue, but other possible issues have not been detailed, like in my case). Symptoms for these are (all assuming the laptop has had one 48 hours uninterrupted charge cycle)
- Unplugged it, used the laptop, left it around for < 20 odd days and tried to start it without plugging it in, it doesn’t start.
- If you unplugged the laptop overnight, next day morning you try to start it, the power button doesn’t respond the first few presses, then fires up
- If you unplugged the laptop overnight, the next day morning you try to start it, the power button doesn’t respond (to first 5-6 presses). Then you hold it down and it fires up.
I have a list of videos on all these behaviours that finally resulted in my mobo getting RMAed by Framework.
Laptop not starting after remaining unplugged for 21 days or more is an un-resolvable hardware issue that I have accepted I’ll live with.