Respironics Original Medical Battery 1002738 3.7V 2.3Ah Li-Ion Battery
Amazon.com: Renata 10 X 386 Swiss Made Lithium Coin Cell Battery Sr43W : Health & Household
VARTA-V386 watch battery 1.55v
Energizer - 386BPZ - Battery,Coin/Button,Silver Oxide,1.55VDC,110mAh,Flat Top,Energizer ZERO MERCURY - Allied Electronics & Automation, part of RS Group