The Nano CIC and SX2000 come with a 6-month supply of batteries. Nano states in its user manuals that these batteries should last 3–7 days. Rechargeable Nano hearing aids can work for up to 16 hours fully charged. Nano recommends that a person turns off their hearing aids overnight or when they are not in use to conserve battery power. Additionally, Nano advises that a person should not charge hearing aids for longer than 4 hours.