Originally posted by justletmein
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Please note that if you use a Unprotected 18650 battery in the light, you can damage the battery because the light can drain the battery too and that damages the battery and that is why we designed the lights for a protected battery. The protection circuit in the protected battery will cut power from the battery before the battery can be drained too low. For example, if you have a unprotected battery in the light and accidentally leave the light on it will drain the battery all the way down and probably ruin it. With a protected battery, it will not be able to drain the battery all the way down because it will cut power from the battery when the battery reaches about 2.7V thus protecting the battery from damage.
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