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Laptop Battery Not Charging When A/C Cord is Plugged In

My Dell Inspiron 1520 laptop with the original battery is 5 or so years old. The last time I had it on and plugged in, I was only running on battery power and the battery didn't recharge through the A/C plug.  We checked the power cord and it is working, but now the battery has completely drained and I cannot turn the laptop on.

Is it a safe assumption that the battery needs replacing or could there be another issue?

Also, is there a way to select A/C vs. battery power mode?

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