con 18650 mi viene in mente solo questa:

Ma in realtà è una frontale utilizzabile come torcia ad L
ST6-500CW
Features
LED:CREE XML T6 Cool White
5 modes
Super: 500lm/1.4hours
Max: 320lm/2.5hours
Med1: 150lm/8hours
Med2: 50lm/28hours
Low: 8lm/8days
Battery
One 18650 rechargeable Li battery with range from 3.7V to 4.2V or 2*CR123
Reverse polarity accepted circuit
Electrically conductive aluminum body provides inherent EMI/RFI shielding
SCHOTT ultra clear lens
Polarity reversibility
IPX8 waterproof
Weight
without battery:50g
with battery and headband:150g
Dimension
Length:78mm
Width:52mm