fix(battery_simulator): disable if 0, adjust limit to 0

ROMFS/px4fmu_common/init.d-posix/rcS

@@ -249,7 +249,7 @@ fi
 
 load_mon start
 
-if param greater SIM_BAT_DRAIN 0 || param compare SIM_BAT_DRAIN 0
+if param greater SIM_BAT_DRAIN 0
 then
 	battery_simulator start
 fi

docs/en/simulation/failsafes.md

@@ -47,7 +47,7 @@ To control how fast the battery depletes to the minimal value use the parameter
 By changing [SIM_BAT_MIN_PCT](../advanced_config/parameter_reference.md#SIM_BAT_MIN_PCT) in flight, you can also test regaining capacity to simulate inaccurate battery state estimation or in-air charging technology.
 :::
 
-The simulated battery can be completely disabled by setting [SIM_BAT_DRAIN](../advanced_config/parameter_reference.md#SIM_BAT_DRAIN) to -1. This is useful, for example, if you provide an external battery simulation via MAVLink.
+The simulated battery can be completely disabled by setting [SIM_BAT_DRAIN](../advanced_config/parameter_reference.md#SIM_BAT_DRAIN) to 0. This is useful, for example, if you provide an external battery simulation via MAVLink.
 
 ## Sensor/System Failure
 

src/modules/simulation/battery_simulator/battery_simulator_params.yaml

@@ -6,11 +6,11 @@ parameters:
       description:
         short: Simulator Battery drain interval
         long: |-
-          Set to -1 to entirely disable the battery simulator.
+          Set to 0 to entirely disable the battery simulator.
           This is useful when the battery is simulated externally and interfaced with PX4, for example through MAVLink.
       type: float
       default: 60
-      min: -1
+      min: 0
       max: 86400
       increment: 1
       unit: s