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I use a 900 amp jumpstarter with a 4-channel 1000 Oaks heater which last a good 2 nights on one charge. I feel a lot of warmth in the strips at only 40-50% power but my case only about 30% is necessary to keep things dew free in all but the worst conditions. The heaters don't operate constantly, but rather in "pulses" or "waves". In other words, the heater will warm up, then switch off for a short period, then when temp starts dropping it will switch on again. I don't know if other brands do this. I'm guessing it works this way to save battery life.
5-6 seems like a pretty short time to drain a jumpstarter just from using dew heaters.
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