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🔋 How long will my fridge run? A good rule of thumb: 1Ah of your 18V tool battery ≈ 1 hour runtime for a 30–40L fridge. Here’s a real-world example with 2 × 6Ah Makita batteries 👇 🛠️ Battery Setup • 2 × 6Ah 18V Makita batteries • Total capacity: 12Ah × 18V = 216Wh 🔄 DC to DC Conversion Efficiency • Approx. 95% efficient • Usable power ≈ 205Wh 🔌 12V Output Conversion • 205Wh ÷ 12V = ~17Ah at 12V ❄️ Fridge Example • 35L Bushman’s fridge • Manufacturer: 0.5Ah average draw at -2°C in 25°C ambient • Real-world scenario: Fridge set to 2°C, shaded, pre-cooled, occasional door opens ⏱️ Estimated Runtime ➡️ ~12–13 hours from 2 × 6Ah tool batteries ✅ Ditch the dual battery setup — power your fridge all day using the gear you already own.