No. Any 18650 Li-Ion battery may be used. For your own safety, it is important that you use an 18650 battery with a protective circuit from a trusted manufacturer. The ILLUMAGEAR 18650 is a top-quality 3400 mAh battery with a protective circuit and is IEC-certified. We cannot guarantee the quality, safety, or run times of batteries purchased elsewhere. Many Li-Ion batteries offered online today make bogus claims regarding their specifications.
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