update battery circuit

README.md

@@ -79,13 +79,13 @@ RadiationD-v1.1(CAJOE):
 
 12V power mod with step down converter and voltage divider for voltage measurement:
 
-    BAT+ --+--------------.
+    BAT+ --[FUSE]--+--------------.
                    \R\            |
                     \1\           '
                       >---+--------------------------------- A0
                     /R/   |       .    ________________
                    /2/   === C1   +---| buck converter |---- 5V
-    BAT- --'------+-----------|________________|---- GND
+    BAT- ----------'------+-----------|________________|---- GND
 
   Example values: R1=1MΩ, R2=100kΩ, C1=some ceramic capacitor (optional)
   measures up to ~30V