Watson Lithium-Ion Battery Pack (3.7V, 1800mAh) for HD B-1801
Lithium Ion Polymer Battery - 3.7V 500mAh | TinyCircuits.com
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
PKCELL Flat Top 18650 3.7V 3000mAh Rechargeable Li-Ion Battery