The most common cause is a non-Acer supplied battery. To explain why this is requires us to know about the battery fires a few years ago and how makers locked out non-maker batteries.
If it is an Acer battery your technician checks connections from the battery connector to the motherboard and if those are good they put in a new motherboard as the circuits that do all this are on that board.
There seem to be people with issues similar to mine across the web and with different notebooks, but I can't seem to find a consensus on what is causing this.
Recently, my Acer Aspire 5738 notified me that the battery cannot hold its charge and I should consider replacing it, and that it may shut down randomly if not connected to the AC, etc. So, I bought a new battery. Now I'm getting the message "No battery detected" when the I insert the new battery. I made sure the battery was compatible, it fits, that everything looked clean, etc. What could be causing this issue?
Some people say it's a windows 7 thing, others say it's a motherboard issue (due to the battery circuits [or something] being connected to the mainboard), and I can't seem to find a solution. Obviously, I'm past warranty.
Any advice on what may be causing this issue and what my next steps would be?
The computer still works as long as it's plugged in, so it's not the end of the world, but it would certainly be nice to have a working battery!