Canon 2554B001 PowerShot SD790 IS / DIGITAL IXUS 90 IS Camera User Guide - Page 202
The Memory Card
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200 z Since this is a lithium-ion battery, you need not discharge it before recharging. z You are advised to charge the battery on the day of use, or one day before, to ensure a full charge. • Even charged batteries continue to discharge naturally. z It takes approximately 2 hours 5 minutes to fully charge the battery from a depleted state (based on Canon's testing standards). • Charging it within a temperature range of 5 - 40 °C (41 - 104 °F) is recommended. • Charge times may vary according to the ambient temperature and the battery's charge state. z If the performance of the battery diminishes substantially even when it is fully charged, its life has been exceeded and it should be replaced. The Memory Card z The write protect tab on SD and SDHC memory cards. Write Protect Tab Slide the switch up. Slide the switch down. (You can protect the images and other data on the memory card.) Writing/Erasing Possible Writing/Erasing Impossible z Memory cards are high-precision electronic devices. Do not bend them, apply force to them, or subject them to shocks or vibration. z Do not attempt to disassemble or alter the memory card. z Do not allow dirt, water or foreign objects to contact the terminals on the back of the memory card. Do not touch the terminals with your hands or metal objects. z Do not peel away the original label on the memory card or cover it with another label or sticker.