hy .. sorry my bad english... i've buyed the n900 about a week ago.. the charger which came with the phone say's it's output power is 5v and 1300 mah... that means your 1350 phone battery is fully charged in about 1 hour.. which is very fast but not a quality charge.. my battery lasted about 1 day... i've buyed a 5v - 380 mah charger ( with microusb adapter).. and the charging is very slow ( about 4 hours fully charge) .. but it's a quality charge... my phone last's about 2 days or more.. i hope it helped.. try this.. it worths