Ich habe mir das so wie im Code gedacht.

MfG
Code:
                    VCC = 12 V
                     +
        R8           |
        ___        o-+
     <-|___|-+-o--__       A Laden
             |+    o-+     |
             -   |   |     |
        R11 ---      |     |
        ___  |-  | o-+--+  V Entladen
     <-|___|-+-o--__    |
                   o-+  |
                     |  |
                    === |
                    GND |
                        |
                R7   ||-+
                ___  ||<-
           <-+-|___|-||-+
             |          |
            ---         |
            --- C4      |
             |          |
           <-+----------+
                        |
                       .-.
                       | | R1
                       | |
                       '-'
                        |
                       ===