Sure, try it. I however would replace the battery anyway. One of the signs of battery wear is the ability to hold the voltage still. When things like that start to happen it simply means the battery is done even though the capacity might be good. Well unless you want to wait a month and see your phone restart when receiving the most important call. Edit: I fired up my N9 to check this. My battery is quite new. I do not have any equipment at hand but Nokia Energy Profile should tell us what we are dealing with here. Battery is at 64% charge. When I inserted a sim card, voltage dropped from 3.92V down to 3.86V and current was 434mA at the time. If what NEP says is true then your battery really needs replacing.