Canon VIXIA HF G21 Instruction Manual - Page 135
Built-in Rechargeable Lithium Battery, Disposal, When you delete movies or initialize a memory card
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Safety Instructions and Handling Precautions • Secure Digital (SD) memory cards have a physical switch to prevent writing on the card so as to avoid the accidental erasure of the card's content. To write-protect the memory card set the switch to the LOCK position. Built-in Rechargeable Lithium Battery LOCK switch The camcorder has a built-in rechargeable lithium battery to keep the date/time and other settings. The built-in lithium battery is recharged while you use the camcorder; however, it will discharge completely if you do not use the camcorder for about 3 months. To recharge the built-in lithium battery: Connect the compact power adapter to the camcorder and leave it connected for 24 hours with the camcorder off. 135 Disposal When you delete movies or initialize a memory card, only the file allocation table is altered and stored data is not physically erased. When you dispose of a memory card or give either to another person, initialize it using the [Complete Initialization] option (A 29). Fill it up with unimportant recordings, and then initialize it again using the same option. This makes recovering the original recordings very difficult.