Don't be caught with a dead battery in your all night events.   Buy a few extras and keep them charged to give yourself unlimited use of your hoop.  This battery is for Trick Concepts Glow Hoops.  Our 18650 battery is custom made for us to take the abuse that a hoop can dish out. Standard batteries typically fail within hours because they are not made to handle the abuse that a hoop dishes out. Each battery will provide about 4 hours of run time and is rechargeable hundreds of times.  Only use the chargers provided with the hoops to charge these batteries.  Each hoop uses one battery.