Apparently a bad imitation or quality degradation at Sony

Apparently a bad imitation or quality degradation at Sony

SON Battery BST-37 K750I / W800I (Electronics)
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Customer Review

I bought the battery for my W550i, as this (instead of originally about 12 days long time) came only 2 days without charging ends meet. This battery holds a maximum of 4 days, if you do not call. Real disappointing!

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