No. Please don't thank me. I've been trying to teach you how to fish, rather than serving you a fish that I have caught, cleaned, cooked, and plated, in a nice teriyaki glaze with a side dish of rice and vegetables.
I have not been successful. I don't know why, since I am not there with you, looking over your shoulder as you work, nor speaking in conversation with you at the time you are formulating your questions. Perhaps there are other ways than the written word which are easier for you to use to learn?
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You might find additional information about your blinky lights if you examined the battery for a Dell model number, and use that in a future Google search. Google already told me that the L400 can use many different Dell batteries. If the battery is not Dell brand, then the manufacturer's make and model number could also be searched the same way.