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obs: battery reports 1% while charging (expected 99%) #4

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opened 2026-10-19 03:42:41 +00:00 by time · 0 comments
time commented 2026-10-19 03:42:41 +00:00
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BATTERY? returns 99 01 (99%, charging) per the README whenever the printer is charging, but on the P21 at 09:E2:D5:44:88:8A it returned 01 01 — 1% with the charging flag set — while the printer was plugged in and presumably fully charged.

Possibly a per-unit/firmware quirk (the status ESC commands are also silent on this unit), or the BCD/charging-flag decode in the README is subtly wrong for some states. Worth capturing BATTERY? replies over a charge cycle (plugged in, unplugged, draining) to confirm the encoding before changing the decoder in p21_print.py / the web UI.

Reported 2026-10-18 during web UI development (branch webui).

`BATTERY?` returns `99 01` (99%, charging) per the README whenever the printer is charging, but on the P21 at 09:E2:D5:44:88:8A it returned `01 01` — 1% with the charging flag set — while the printer was plugged in and presumably fully charged. Possibly a per-unit/firmware quirk (the status ESC commands are also silent on this unit), or the BCD/charging-flag decode in the README is subtly wrong for some states. Worth capturing `BATTERY?` replies over a charge cycle (plugged in, unplugged, draining) to confirm the encoding before changing the decoder in `p21_print.py` / the web UI. Reported 2026-10-18 during web UI development (branch `webui`).
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daru/nelko-p21-print#4
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