Batteries : Battery Lithium Ion Cylindrical 3.7v 2200mAh ...
Amazon.com: PKCELL ICR18500 Battery 3.7V 1400mah Li-Ion Rechargeable with Button Top 6PC(They are not 1865mm Batteries Also Not AA Size Battery) : Health & Household
Watson Lithium-Ion Battery Pack (3.7V, 1800mAh) for HD B-1801