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I have a 2007 Dell Inspiron 1720.
The original 9-cell battery lasted just over 12 months. Dell wanted $250 to replace it, so I laughed at the guy, hung up and went onto eBay.
I found a guy out of China who was selling the same 9-cell battery for $75 landed, so I bought one as his feedback was 99%+.
Nearly 4 years later, and I can still get 4-5 hours out of it, with the lappy running 24/7.
I have run it without the battery in, but I do tend to pick my computer up and walk off. I have lost hours worth of data, so now the battery stays in.
Also, the power fitting has gotten loose over 5 years, and sometimes the power cord just falls out. Not a good end to a data entry session!
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