I have been using Sony Ericsson K790 from last couple of months initially battery used to last for long but now it is not. So I want go for extra BST-33 battery which can be used after the main battery runs down. Especially when I use camera and music player it causes the battery to run down quickly. Can I go for third-party battery which can be cheap compare to original one? Or should I buy an OEM battery?
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