here are the batteries they&#x27;re using:<p><a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;NCR18650B-3400mAh-Rechargeable-Battery-Panasonic&#x2F;dp&#x2F;B00DHXY72O" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;NCR18650B-3400mAh-Rechargeable-Battery...</a>