Battery not detected intermittently

I'm a very capable user running a Dell E1505 here. The battery lasted
less than a year, and then I replaced it with a brand new battery. This
has been in there for at most a month now. The past two days I have had
an interesting situation going on. The computer is running Vista Home
Premium, and it's running on AC. The battery seems to be working fine.
It's detected fine, the PC runs off of the battery, and it charges as
well. It's not set to suspend, hibernate, or anything like that at any
time; these features are all deactivated because I am never in a
situation to use them.

However, for the past few days, I have closed the lid and then gone to
sleep at night, but when I have opened it up the next morning, I have
the red X icon that says the battery is not detected. I've unseated the
battery and clicked it back in each time, and it is immediately
recognized and operates completely normally as described above after
that. The first time that this happened, I thought it may just have
been some odd thing as can happen now and then with computers, and I
ignored it. I went through my day using the E1505 as usual: leaving it
unattended for minutes or hours while doing other things, closing the
lid before going to the store, opening the lid again, etc., and it
worked fine. However, when I awoke this morning the X was there with
the no battery message. I again unseated and reseated the battery, and
all seems normal.

I'm a bit confused, as well as concerned about the situation. Any
thoughts? Thank you!

It's probably the charger component on the motherboard. This is a common
problem with Dells. Call Dell tech support.

Update - it had done it again when I came home tonight.

If I unplug the AC, the computer immediately switches to battery power,
recognizing the battery and switching the meter to battery. If I plug
the AC back in, the computer immediately switches back to AC with the
battery/plug icon and charges normally. This is different from every
other account of "battery not detected" trouble I've read in researching
this (quite a few) in that in all of those cases, unplugging the AC
caused the computer to run off of battery -but without "realizing" that
it was-. In other words, the icon would remain the Plug with the X over
the battery and the PC would think it was on AC power even while
operating off of the battery.

call dell it sounds like a hardware problem.

Doesn't matter. Probably is the motherboard. Call Dell.

Thanks. As a second question to try to know as much about this as I
can, when the battery is charged 100%, what should the icon say? Mine
currently says "100% available (plugged in, charging). It shouldn't be
charging if the battery's full, though. I've tried to google this issue
and all I've come up with is some stuff for a Sony laptop and the
general consensus there seems to be its normal. I've checked the 5
light meter on the actual battery and it I in fact full; it's not simply
the software or BIOS thinking it is full.

You're wasting your time and everyone else's. Do as Malke said
several hours ago and call Dell.

[Bahemith]

Try and narrow it down before calling Tech support. I had this Exact problem, and guess what?? It was NOT the MB.