I bought this charger as an addition to the many others i own for my W810i. i have to charge is often because i use it as a modem when i can't get a wifi connection. it works very well and charges the phone at a decent speed, however i do have one very large complaint. the cable that plugs into the phone is not perfect and needs to be jiggled a little or a certain amount of force needs to be applied before it "clicks" in and begins charging. Besides that i think its a great product and at 30 dollars less then the Sony Ericsson alternative i think its a bargain.