Sony ILCA-77M2 - Manual (Page 190)

[269] Troubleshooting Troubleshooting Battery pack and power
You cannot insert the battery pack into the product.
Make sure the direction of the battery pack is correct, and insert it until the battery lock lever is
locked.
[270] Troubleshooting Troubleshooting Battery pack and power
You cannot turn on the product.
After inserting the battery pack into the product, it may take a few moments for the product to power
up.
Make sure that the battery pack is inserted correctly.
The battery pack will discharge by itself even if you do not use it. Charge the battery pack before use.
Make sure that the battery is NP-FM500H .
[271] Troubleshooting Troubleshooting Battery pack and power
The power turns off suddenly.
Depending on the product and battery pack temperature, the product may turn off automatically to
protect itself. In this case, a message is displayed on the product screen before the product turns off.
[272] Troubleshooting Troubleshooting Battery pack and power
The remaining battery level indicator shows an incorrect
level.
This phenomenon occurs when you use the product in an extremely hot or cold location.
Battery capacity decreases over time and through repeated use. If decreased usage time between
charges becomes significant, it is probably time to replace it with a new one.