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If you want to save some battery and only heat to the level needed, don't use the dew controller with just the variable knobs to control the power (varies the PWM width like a light dimmer so average power is controlled)
Use a controller which at least can keep your guidescope front perhaps 3 deg above the ambient air temperature (it has a sensor for ambient and a sensor that is placed next to heater around guide scope). Kendrick digifire from Canada or local at Bintel is an example. The extra cost with this I think is worth it not to heat up scope more than necessary and also save battery power.
A better option is a controller that can keep the sensor above the dew point. In addition to the ambient temperature sensor, it also has a humidity sensor. This will save even more battery power.
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