Inaccurate Battery Life

I have an Acer Aspire. I had bought a different battery but wanted to try this one. Battery life is LOW. I've had batteries that lasted 3-4 hours. This one.....This one tells you you have 3 hours left, and then in 1 hour, it's telling you you've got 10 minutes left. In 1 minute, your computer suddenly shuts down because of "low" battery life. It gets drained like crazy and you can't even rely on the computer's battery life projection. I will not use again. In fact, I'm going to buy a new one so that I don't have to use this one.

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