Sony ILCA-77M2 - Manual (Page 181)

If you use the flash often, shoot images continuously, turn the camera on and off frequently, or use a
brighter setting for the screen, the battery life will decrease.
Battery life
The battery life is limited. If you use the same battery pack repeatedly, or use the same battery pack
for a long period, the battery capacity decreases gradually. If the available time of the battery pack
shortens significantly, it is probably time to replace the battery pack with a new one.
The battery life varies between different battery packs, and according to how the battery pack is
stored and the operating conditions and environment in which it is used.
Storing the battery pack
To maintain the battery pack’s function, charge the battery pack and then fully discharge it in the
camera at least once a year before storing it. Then remove the battery pack and store in a cool, dry
place.
[259] How to Use Precautions/This product Precautions
Memory card
Memory card
Card Type Indications in Help Guide
Memory Stick PRO Duo media
(Memory Stick XC-HG Duo media/Memory Stick PRO Duo media/Memory Stick PRO-HG Duo media)
SD card
(SD memory card/SDHC memory card/SDXC memory card)
Memory Stick PRO Duo media and SD cards up to 64 GB have been tested and proven to operate
with this product.
When recording movies, the following memory cards are recommended:
(Mark2) (Memory Stick PRO Duo media (Mark2))
(Memory Stick XC-HG Duo media (Mark2))
(Memory Stick PRO-HG Duo media)
Class 4 SD card or faster
SD cards also support UHS-I standard.
Note
When you use a memory card with this product for the first time, it is recommended that you format
the card using the product for stable performance of the memory card before shooting.
Note that formatting permanently erases all data on the memory card, and is unrecoverable. Save
precious data on a computer, etc.
If you repeatedly shoot and delete images for a long time, fragmentation of data in a file in the
memory card may occur, and movie recording may be interrupted in the middle of shooting. If this
happens, save your images to a computer or other storage location, then execute [Format].
Memory card formatted with a computer is not guaranteed to operate with the product.