Your Mi-Pod battery can last at most 2 full days on a full charge.
Always take into consideration how often you use the device. Continuous use can decrease the battery lifespan. Extended or intense usage of the Mi-Pod device will hurt the battery-life in the long run. Be sure to charge your device often. Do not allow the Mi-Pod to sit on an empty battery for an extended time. If your Mi-Pod isn't holding a charge, you may be eligible for a warranty.