What does the orange light on my MagSafe battery mean?

Hello I bought a MagSafe battery pack off someone on the internet, I have seen the receipt and was happy at getting it for that price. When charging it the orange light comes on for a few seconds and goes off tried 3 different chargers. Is it supposed to go off after few seconds. The person who sold me it has brilliant feedback and this is my first time buying if it’s faulty I don’t want to look like I’m pulling a fast one being new user . Thanks guys

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