Kanger Tech produces this classic pen style 1000 Pass Through battery

• Chargers with the Usb Connection Pass through Charger from the bottom of unit.
• Roughly 11 1/2 hours of  use on one charge.
• Evod Style flush button / redesigned ego style 510 connection for increased ease of use.
• On / Off safety feature
• 5 quick clicks turns on or off this unit,
• 1 - 2 hours charging time.

Includes 

• 1 1000 mAh Pass Through Battery
• 1 Pass Through charging cable (USB connection)