This battery for the Sony Ericsson is made using high quality CE approved Japanese cells which will power your phone wherever you need. We test all of our batteries before they reach our shelves so you can be sure of their high standard. The battery for the Sony Ericsson (amongst others) has an overcharge prevention circuit which apparently extends the lifetime of the battery beyond that of those without this special circuit. Key Features. Same performance as an original Sony Ericsson battery but only a fraction of the price . Overcharge prevention circuit to extend the battery s functional lifetime. CE approved and RoHS compliant.