Audio recording takes little batteries in my experience.
Audio files also take little space. At a sample rate of 16 kHz and a bitrate of 128 kbps it takes me about 1.3 GB per day, 474 GB per year.
When I go to bed for the night I stop the recording and start a new one. When I wake up I stop the recording and start a new one. So I usually have two files every day. However, I will sometime stop and start a new recording throughout the day. For example, if I want to listen to audio from earlier in the same day or if I want to identify a specific conversation in its own file.
I name the files YYYY-MM-DD hh:mm:ss. I will sometimes edit the name of the file to add some information after the date, such as who was in the conversation.
I keep track of my events in a Google Calendar and my tasks in a Google Sheet. If I want to retrieve a conversation, this can help me find the date and time it happened. The files have the date and start time at the beginning of their name, so I can easily find the right file and know how much to forward in it, at least if I haven’t paused the audio or skipped silences, in which case it makes finding the exact time a bit longer. I also have a Google Doc where I note some conversations I want to bookmark.
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Audio recording workflow