I was given a switch 10v without the keyboard last year and, whilst it booted and worked fine to start with, after leaving it a few months when I tried to switch it on it just came up with a "Critical Battery" message then went blank again.
I assumed the battery needed charging so plugged it in, the power light went orange but after 2 days it is still orange and wont turn on. I have tried the various button combinations (power/vol-up/vol-down) but nothing changes.
I wondered if the battery was completely dead but when I opened the case and tested I am getting 3.7v from the battery connector so I assume it is ok. I also checked the power connector and the 12v supply is getting to the PCB power connector.
Any further thoughts on what to try next?
[Edited the thread to add issue detail]