About the Built-in Rechargeable Lithium Battery
This camcorder has a built-in rechargeable lithium battery to retain the date, time and other settings. The built-in battery is recharged every time you use the camcorder. However, when you use the camcorder for only short times or do not use it for a period of over 3 months, it will become totally depleted. In that case, recharge the built-in battery by powering the camcorder from a power outlet and leaving it with the <POWER> dial set to <OFF> for at least 24 hours.