Long-Lasting Battery Go the distance with the MP300. Offering 15 hours of continuous music playback, even the slowest of marathon runners will finish long before the battery does. The integrated lithium polymer battery only requires a few hours to fully recharge giving you just enough time to get your breath back before the next event. And for complete peace of mind, the handy dual-color LED indicator will keep you informed of the battery status so you can stay active. There's no better workout companion than the MP300.