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I've ordered a new 3rd party battery for an old laptop.

After unpacking I could feel a lump in the middle of the battery about 1 cm across, something under the plastic however the plastic hasn't cracked.

The battery charged fine.

Googling I found lots of Macbook battery issues. Is this similar? Should I return it?

If it's cosmetic, I'm not fussed. But I am concerned if it will blow up or damage the laptop.

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    Including a picture would be helpful, but if you're worried why not send it back? – slhck Apr 17 '13 at 11:44
  • To help improve future questions/answers, include as much detail as possible. For instance, if you include brand and model information, someone who is familiar with it can give you a complete answer to your question. As @slhck stated, pictures help greatly. – CharlieRB Apr 17 '13 at 12:35
  • I'll add a photo this evening. The battery is some random brand from Smart Parts UK, via Amazon UK – user127379 Apr 17 '13 at 12:51
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You cannot know if the issue is cosmetic or a problem with one of the Li-Ion cells within the battery unless you take it apart and peep inside. If in doubt return it and ask for a replacement.

That said, if one of the cells is damaged, the battery will not give you the promised hours of running time as its power retention capacity is reduced.

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