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Extra Battery
The extra battery is the key add-on if you’re trying to do long weekends without babysitting power. Anker rates the 40L at up to 104 hours with two batteries under their test conditions, and that’s exactly what I want to validate over the summer.
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Pros
- +Doubles the cooler’s rated runtime (40L: 52 hours to 104 hours under stated test conditions)
- +Can be charged via USB-C and used to power devices via USB ports
Cons
- -Added cost (about $200 at the time I recorded)
- -Extra battery weight and another item to manage/charge
