Update BullTron README details

README.md

@@ -150,8 +150,8 @@ The GUI shows:
   charge/discharge current and watts, and computed time-to-empty/time-to-full
 - alarm/status words decoded into readable alarm names where known
 - system/settings values such as the control PIN, firmware/version text,
-  product info, battery code/SN, production-date raw value, and inferred battery
-  Ah when the settings block contains a plausible capacity
+  product info, battery code/SN, parsed production date where possible, and
+  inferred battery Ah when the settings block contains a plausible capacity
 - raw TX/RX frames for debugging and protocol confirmation
 
 The settings tab has MOS on/off controls, but writes are deliberately guarded:
@@ -160,6 +160,11 @@ The default write registers mirror the BullTron system screen: `0x00A5` for
 charge MOS and `0x00A6` for discharge MOS. The live MOS status still comes from
 read-only telemetry registers `0x0035` and `0x0036`.
 
+The MOS status can lag the requested control state until that MOSFET path is
+actually used. For example, disabling charging may still display as ON while
+the pack is idle or discharging; it only reports OFF once charging is attempted
+and the BMS applies the charge MOS state.
+
 Scan results are sorted so likely BullTron devices appear first. The Android app
 accepts scanned devices whose BLE name contains `DL` or `B35`, or whose legacy
 advertising payload contains marker bytes for `DL`, `PU`, or `JHB`. The desktop
@@ -241,14 +246,18 @@ Important fields:
 | `0x003A`-`0x003D` | Alarm/status words | 16-bit bitmaps |
 
 Time-to-empty/time-to-full is computed by the app instead of read as one live
-BLE value:
+BLE value. Current app logic uses the remaining-capacity register when present,
+falling back to rated capacity times SOC fraction only if remaining Ah is not
+available:
 
 ```text
-if register 0x002F == 1:
-  time-to-full = rated_capacity_Ah * (100 - SOC_percent) / abs(current_A) * 60
+remaining_Ah = register_0x0030_Ah if available else rated_capacity_Ah * SOC_percent / 100
 
-if register 0x002F == 2:
-  time-to-empty = rated_capacity_Ah * SOC_percent / abs(current_A) * 60
+if current_A > 0:
+  time-to-full = max(rated_capacity_Ah - remaining_Ah, 0) / abs(current_A) * 60
+
+if current_A < 0:
+  time-to-empty = remaining_Ah / abs(current_A) * 60
 ```
 
 ## Repository Contents