
1. Batteries are really 186502. You need to use an external charger for 18650 batteries like vaping. This method is the safest and the batteries will never explode. You don't want to USB charge this type of battery and think the circuit is good for charging.3. I was able to replace/charge the included battery, there will be no downtime.4. It's not very bright but it's great for what I need! Thanks very much! Hope my experience helps :)

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