If you want to go with the smaller 650mah batteries then a day out will take at least 2 of them and maybe a spare or PCC case . That is without backup protection in case you burn though a battery a bit fasther on that day . You can fit 3 of them in a PCC case and with the charging of the case I would say have no worries . Myself I know I can normall use on 1000mah and if I chainvape at all I may need the second 1000 mah or even 1 650mah batter for the couple of hours I may need . So my say is at lease 1 1000mah and it probably will last most or all day but bring a backup and maybe a backup for the backup to have peace of mind .
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