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Windows 7 random unexpected shutdowns, cannot find cause
Okay, so here's my story. Bought my Acer Aspire 5750-9851 about 4 years ago, upgraded ram to 8gb, otherwise no modifications. June 2014 I replaced my aging battery with an extended capacity one from Newegg, approx $40.
Since then, I have never gotten the battery to drain fully, while working on battery, the computer would shut down randomly, 30% battery, 70%, 50%, no patter whatsoever. There would be no warning, no low battery popup or anything. The shutdown was immediate, as if you unplugged the battery. The computer would only start up when I plugged it in, or waited a few hours which I only did once because I need my computer. Upon startup, it would say windows recovered from an unexpected shutdown, and I would start windows normally.
This happened until November, two days before Thanksgiving the computer shut off randomly again and never turned back on fully, safe mode would only yield the windows background, nothing else, with or without the battery plugged in or anything. I learned that my windows was corrupted and my computer was shot. $300 later I had a "local computer guy" recover my files and wipe everything clean. Completely new fresh software with an upgraded Windows Professional that he took from a Dell computer. I reinstalled the basic programs I needed, Itunes, MS Office, the usual. Thinking that the corrupted hard drive was caused from these unexpected shutdowns, after having the computer wiped, I thought I was free and clear. Then it kept happening, This unexpected shutdown would occur at virtually any battery percentage, most commonly under 50%.
I thought the battery was bad, I recently replaced it with another extended capacity battery, and it keeps happening. To try and locate and solve the issue, I have run multiple anti virus and malware scans, I have done a hard drive test and a memory test that all came up clean. I was able to find the event tracker and log all of the unexpected shutdowns, however I do not have the knowledge to make any sense out of it.
I am a college student, I use my computer for emails, MS Office, music, and the occasional movie. I am not a gamer, and don't do anything extravagant to cause my computer to overheat which I do not believe to be the problem.
Some information about the shutdowns. Like I said they are random, the most recent shutdown occurring at 80% right as I began a windows update. Commonly, as I am doing homework, I would leave open a word or adobe file, and maybe two or three windows open in chrome. I would just reference the computer for my homework assignment and leave it as is. When I was done, the second I exited my browser or word or whatever I had open, the computer would shut down. I have researched this for hours and could not find any case that was identical to mine, only similar, I have tried many different things to pinpoint the issue, however no luck.
Does someone have any advice as to how to fix this problem? I really don't want to be tethered to a wall everytime I need my computer. Thank you!!