With battery modes on, a grid charge the peak guard (or a measured headroom) stops in the first 60 s of a period no longer latches off for the period: it may start again once the period is 60 s old, if the guard is clear and the headroom is over START_W. A stop after 60 s latches as before. In a young period no charge starts while the batteries' give is still falling (over START_W within 15 s), since the meter may not show that drop yet. The guard itself is unchanged, so a real over-aim load is cut on the same cycle. DECISIONS/SAFETY-135-young-period.md, test_safety135.py. Co-Authored-By: Claude <noreply@anthropic.com>