MYSTERY: T410s runs without the battery or the plug

I have a video if anyone needs to see it about this Thinkpad 410s.
I always pull the battery to replace a screen on a laptop.
After replacing the screen I got ready to test it.
I forgot to repace the battery and with the power adapter NOT connected
it booted once before I realized what it was doing.
I then turned my smartphone camcorder on and it booted a second time.
Is there a second battery or is it running on capacitors?
BTW: it had been unplugged 3 days before I changed the screen.
Solved!
Go to Solution.

Hello and welcome,
I believe that model can have an ultrabay battery instead of an optical drive.  Should be obvious from the outside.
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.  The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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