Newest edition to the CCELL product line.  High end palm battery with magnetic connector for 510 thread.  Possibly the smallst and most descreet palm battery there is.  Made from brushed aluminum. USA made.
 
Details
Battery Capacity: 500mAh
Dimension: 63 * 18 * 28.8mm
Rechargeable with Micro-USB Port
Quality Circuit Board with Multi-Protection
Aluminum Alloy Housing
Inhale Activated
Stealthy Breathing LED Indicator
Magnetic Connector with Built-In 510 Thread