With expiration date! ??

After almost exactly 3 months both batteries give up the ghost quite complete (approximately May 13 - 08/12/2013).
Unlike the original part of the battery, the power goes out but not gradually, but they have become useless within 3 days with little warning. Again, both batteries at the same time ??!
Coronation: The day before yesterday evening, I wanted one of the batteries in the charger, as dissolves below the contact (metal pins) !!
Strangely, all within 2.5 days exactly 3 months after purchase.

Conclusion: Well, the first month dream. My S2: although optically no longer top, like a new phone feels, only without the hassles of data transfer.
After that normal, and then the Kill Switch ..
That does not have these parts for eternity, I thought yes. After the anger had subsided, I have seriously considered again the set to buy: Now I know: After 10 weeks, her replacement must. But for nearly 23, - EURO !?
For the parts had ever allowed to hold almost half a year.

Now I buy a first original spare Samsung. Is there indeed.
! We should see how the then beats.