T400 battery light blinking orange. Senses second battery error with NO second battery present.

I am using T400 laptop, problem is battery indicator light is blinking orange even though my main battery is well charged. Power manager indicates Battery 1 is fine but it is also showing Battery 2: Error detected. Power manager says main battery condition as good and second battery condition as error? Any Ideas?There is NO secondary battery in the laptop.

2-3 years is a normal lifespan for a lithium-ion battery. The blinking orange light means that capacity is low, which makes sense for a battery at the end of its life. Although you're getting contradictory indications from the Power Manager, I suggest trying a new battery.
There's a community knowledge base article on how to maximize battery life:
http://forums.lenovo.com/t5/Welcome-FAQs-Knowledge-Base/How-can-I-increase-battery-life/ta-p/244800
Hope this helps!
I don't work for Lenovo. I'm a crazy volunteer!

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