Need help with G450 battery: Stuck at 0%, claims 9x% and not charging

Okay, there have been a couple similar posts but they don't provide a definitive answer so I am going to ask again.
A few days ago, I put my computer in sleep mode with a low battery. When I woke it up, it froze and I had to force shutdown. Since then, whenever I unplug the computer, it loses power instantly, indicating that the battery is not powering it. However, my system can still tell when the battery is inside or not. When it is inside, it tells me I have "97% available (plugged in, not charging)", where the 97% slowly decreases over time (at first I had 99%).
What is the problem here? How do I solve it? The "plugged in not charging" issue seems to be fairly common, but the fact that my battery is drained and the way that I got to this point seem somewhat exceptional. If it comes down to buying a new battery, that is not a problem - I could use the extra battery life, and they're pretty cheap.
SPECS: I am using Windows 7 on a Lenovo G450 and do not appear to have Lenovo Power Management software. My AC adapter appears to work just fine.
Solved!
Go to Solution.

hi serpinium,
Welcome to the Lenovo Forums.
Based from your findings, I suspect a faulty battery.
 -- it's possible that the battery circuit inside is not working to unload the charge, or one of the battery already reached its life span.
 -- there's also a chip inside that handles how the battery gets charges and checks the charge level of each battery (both are controlled by a firmware) -- ti's also possible that this chip is malfunctioning.
Batteries degrade overtime due to heat and daily use. If you had this battery for more than a year then perhaps it's time to get a replacement battery.
More info:
How Lithium-ion Batteries Work
Regards
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