Well just two days back i got this DURASTAR BL-5J 1700mah battery form a whole sale shop it costed me almost 13 US dollar..... It is Great i could not fine any where on net the astimate time for those batterie mentioned before..... Well it is Second day and man it is still full.... yesterday i got it by 6pm and the shop keeper told me to charge the battery full before using the cell.... It was fully charged at 8pm till then my N900 was recieved about 10msges then i pluged my cell to tv and listed to two music videos the before going to bed i listed to some music tracks and played block game for about 30 mins then in the morning i have recieved some calls about 15-20 msges.... took a few pictures and amazingly the battery is still full.... It battery is excelent as compared to the original which i got with the set ......