1S300W: 3.7 volt 300mAh 20C rechargeable Li-PO battery for RC drones, quadcopters, helis, planes. Battery dimensions: 1 3/8" long, 3/4" wide, 1/4" thick. Weighs approximately 0.325 ounces.

Recommended chargers:

# 1SW-USBC   (Charges 1 battery at a time)
#  6x1SLiChg  (Charges up to 6 batteries at a time)