ILLUMAGEAR HARB-01A-20 Lithium Ion Rechargeable Batteries 18650 (20-Pack) (10 x 2 packs) 

A box of 20 IEC-certified, rechargeable 18650 Li-Ion batteries with protected circuit (10 x 2-packs).

Meets or Exceeds: IEC/UL 62133

Features and Specs:

• 20 x 18650, 3400 mAh, 3.7V Li-Ion batteries with button top. Certified by TUV.
• Compatible with HAWF-01A as well as other electronics that use an 18650 battery.
• Charger sold separately.