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eBay batteries are often after-market or basically cheaply made batteries. It is usually cheaper because they do not deal with any quality checking or long-term use. They may also not have any form of protection, so some may actually "explode". Also, even though it states 2400 mah, it may not actually hold a full charge, or hold it for long (long being after several recharge cycles). Basically, you get what you pay for.
The only recognized third-party brand battery I've often see people talk about are Seidio, but they are much more expensive than $10. I plan on purchasing an extended OEM battery from them eventually.
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