Sony CX400E User Manual page 247

If the battery pack is not used for a long time, fully charge the battery pack and use it up on your
camcorder once a year to maintain proper function. To store the battery pack, remove it from your
camcorder and put it in a dry, cool place.
To discharge the battery pack on your camcorder completely, select [Setup] [
General Settings] [Power Save] [Off], and leave your camcorder in recording standby until
the power goes off. [Details]
About battery life
Battery capacity decreases over time and through repeated use. If the interval between charges
becomes significantly short, the battery pack may need to be replaced with a new one.
Each battery's life depends on storage, operating and environmental conditions.
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