When I got it, I tested it with about 5oz of water. It takes about 10 min to heat water from 65F to 98F which is fine. But after heating, when I tried to tilt it, I noticed some leaks (see the edge of the tilted bottle and the last photo). So it is better to turn it over very fast to avoid leaking after heating. I do not get a chance to test its battery life, but I feel like it should last for a couple of warming which is enough for outdoor use.
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