That battery life is a bit low and I think these units use proprietary batteries too making them more expensive. We ran the Sytong units continuously for around 6 hours on an 18650 that can be purchased at most electronics stores. Pard also take 18650s as another option. Agree with sneeze on the NETD although think sub 25-30 is the sweet spot. USA has longer warranty periods I think due to legal requirements. But any decent thermal brand should get 3 years.
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