This is a 650mAh SILVER manual battery for Joye eGo. That means a fully charged battery can support a heavy user to vape at least 6 hours! To charge the joye eGo battery with Fast USB chargers,  2 hours is enough for a completely drained battery. Keep the battery dry and away from moisture.Take it as a spare.

Please only use the charger that comes with the starter kit or the fast usb ego battery charger sold as an accessory on this site. DO NOT use the charger that comes with the 510!