While a battery settles from its ended drain (SAFETY-95), the house point was grid + every battery's reading. A register can be 10 s older than the meter, so B swung 860 -> 1650 -> 870 W on A's old reading (rig check 5). Now the house point is held and moved only as far as the meter proves: each battery is between its last changed reading and its commands since (a reading that changed this cycle, or a refused side, as it reads). N=1 and 1 s registers are byte-identical to release/1.0. DECISIONS/SAFETY-103-old-readings-after-a-drain.md, test_safety103.py. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>