n our standard handheld test, we played music continuously from an SD card with the screen forced to stay on, and got 5 hours 16 minutes of uptime. For a mobile device this is less than adequate, and if you keep the device internet-connected via Bluetooth or Wi-Fi, you're unlikely to get a day's-worth of charge from the BP-5L lithium-polymer battery. For the record, Nokia claims up to 3.5 hours of 'browsing time' and up to 12 days on standby.